A cuboid glass container is 20dm long and 15dm wide, and the water depth in the container is 3.8dm. After a cube iron block with 3DM edge length is put into the container, how much DM does the water surface in the container rise?

3 × 3 × 3 ^ (20 × 15) = 27 ^ 300 = 0.09 (decimeter) a: at this time, the water level in the container rises by 0.09 decimeter

Fill a cubic glass tank with water whose edge length is 6 decimeters, and pour it into a rectangular glass tank which is 12 decimeters long, 10 decimeters wide and 8 decimeters high, and the water surface is clear
How many decimeters is the height? (glass thickness is ignored)

Height = 6 × 6 × 6 ﹣ 12 ﹣ 10 = 1.8 decimeters

A cuboid glass container is 20dm long and 15dm wide, and the water depth in the container is 3.8dm. After a cube iron block with 3DM edge length is put into the container, how much DM does the water surface in the container rise?

3 × 3 × 3 ^ (20 × 15) = 27 ^ 300 = 0.09 (decimeter) a: at this time, the water level in the container rises by 0.09 decimeter

Two blank questions in Mathematics
If AB = 5, then AB ^ 2 + AC ^ 2 + BC ^ 2=____

AC ^ 2 + BC ^ 2 = AB ^ 2 because in a right triangle, AB is a hypotenuse! According to the Pythagorean theorem, the answer is 50

What are knitted fabrics

Knitting is divided into weft knitted fabric and warp knitted fabric
(1) weft knitted fabrics are usually made of low elastic polyester or profiled polyester, nylon, cotton, wool yarn and other raw materials. They are knitted on various weft knitting machines by using flat stitch, varying flat stitch, rib plain stitch, double rib plain stitch, jacquard stitch, Terry stitch, etc. they have many varieties and generally have good elasticity and extensibility. The fabric is soft, firm and wrinkle resistant, However, its moisture absorption is poor, the fabric is not stiff enough, and it is easy to loose and curl. Chemical fiber fabrics are easy to fluff, pilling and crochet
1. Polyester yarn dyed knitted fabric: the fabric has bright color, beautiful appearance, harmonious color matching, compact and thick texture, clear texture, strong sense of wool pattern, similar to wool tweed style. It is mainly used for men's and women's top, suit, windbreaker, vest, skirt, cotton padded jacket fabric, children's clothing, etc;
2. Polyester knitted labor fabric: this kind of fabric is compact and thick, firm and wear-resistant, crisp and elastic. If the raw material is core spun yarn containing spandex, it can be woven into elastic knitted jeans with better elasticity. It is mainly used for men's and women's trousers;
3. Polyester knitted wick fabric: the fabric has distinct concave and convex, thick and plump handle, good elasticity and warmth retention. It is mainly used for men's and women's coats, suits, windbreaker, children's wear and other fabrics;
4. T / C knitted fabric: the dyed fabric can be used for shirt, jacket and sportswear. The fabric is crisp, wrinkle resistant, firm and wear-resistant, moisture absorption and ventilation on the side close to the body, soft and comfortable;
5. Artificial fur needle fabric: the fabric is thick, soft and warm. According to different varieties, it is mainly used for coat fabric, clothing lining, collar, hat, etc. artificial fur can also be made by warp knitting
6. Velvet knitted fabric: the fabric feels soft, thick, firm and wear-resistant, with thick pile and soft shade. It is mainly used as outer garment fabric, collar or hat material. It can also be made by warp knitting, such as warp knitted terry shearing fabric;
7. Hong Kong type knitted fabric: it not only has the smooth, soft and bulky handle of cashmere fabric, but also has the characteristics of soft luster, good drapability, non shrinkage and air permeability of silk fabric. It is mainly used as fashion fabric in spring, autumn and winter. (2) warp knitted fabric is often made of polyester, nylon, vinylon, polypropylene and other synthetic filament, It is also made of cotton, wool, silk, hemp, chemical fiber and their blended yarn. It has many advantages, such as good stability in longitudinal dimension, small dispersion, no curling and good air permeability. However, its lateral extension, elasticity and softness are not as good as weft knitted fabrics
1. Polyester warp knitted fabric: the fabric is flat and bright in color, which can be divided into thick and thin type. Thin type is mainly used for shirts and skirts; medium thick type and thick type can be used for men's and women's clothes, windbreaker, upper garment, suit, trousers, etc;
2. Warp knitted fleece fabric: it is mainly used for winter men's and women's coats, windcoats, tops, trousers and other fabrics. The fabric has good drapability, easy to wash, fast dry and non iron, but it is easy to absorb dust due to static electricity accumulation in use;
3. Warp knitted mesh fabric: the mesh fabric is light, elastic, breathable and smooth, which is mainly used as summer shirt fabric for men and women;
4. Warp knitted velvet fabric: the surface is thick and towering, with thick, plump, soft, elastic and good warmth retention. It is mainly used for winter clothing and children's clothing;
5. Warp knitted terry fabric: this kind of fabric has full and thick handle, firm and thick cloth body, good elasticity, moisture absorption and warmth retention, stable Terry structure and good wearing performance. It is mainly used for sportswear, lapel T-shirt, pajamas, children's wear and other fabrics
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Difference between warp knitting and weft knitting
A: knitting can be divided into warp knitting and weft knitting
Warp knitting uses multiple yarns to loop along the longitudinal (Warp) direction of the cloth surface at the same time
Weft knitting is a process in which one or more yarns are looped sequentially along the transverse direction (weft) of the fabric
Weft knitted fabric can be formed with at least one yarn, but in order to improve the production efficiency, multi yarn is usually used for knitting; while warp knitted fabric can not be formed with one yarn, and one yarn can only form a loop
All weft knitted fabrics can be spun against the knitting direction, but warp knitted fabrics cannot
Warp knitted fabrics cannot be hand knitted
Warp knitted fabrics fall into two categories:
One is Raschel fabric, which is characterized by large pattern, rough cloth surface and many holes, and is mainly used as decorative fabric;
The second is tricol fabric, which has fine surface and few colors, but high output. It is mainly used for covering fabric and printing fabric. This kind of fabric is mostly used for chemical filament, otherwise the production efficiency is very low
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Matters needing attention in fashion design
I. using the flexibility of knitted fabrics
Knitted fabrics have good flexibility, which can minimize the seams, pleats, stitches and so on designed for modeling in sample design. Secondly, it is generally not suitable for knitted fabrics to use the techniques of push back and hot drawing, It is to make use of the elasticity of the fabric itself or the appropriate use of folding techniques to fit the human body curve. Then the size of fabric flexibility becomes an important basis in the design and production of the template
Compared with the area needed to wrap the human body, the woven pattern is generally larger, that is, there is a certain amount of looseness relative to the human body. According to the different fabric structure, if the fabric with high elasticity (related to the yarn and organizational structure) is designed, the looseness will not be left, and the size of the pattern can be the same as the circumference of the human body, The elastic coefficient can also be considered to reduce its size
Second, use the curling property of knitted fabric
The curling of knitted fabric is the phenomenon of edge fabric curling caused by the disappearance of the internal stress in the edge loop of the fabric. Curling is the disadvantage of knitted fabric. It can cause the seam of the garment to be uneven or the size of the garment edge to change, and ultimately affect the overall modeling effect and the size of the garment, For this kind of fabric, it can be solved by adding the size of the edge, inlaying rib or rolling, and inlaying adhesive interlining at the edge of the clothing. The curling of some knitted fabrics has been eliminated in the process of fabric finishing, which avoids the trouble in the sample design
It should be pointed out that many designers can take advantage of the disadvantages on the basis of understanding the fabric performance, and use the crimping property of the fabric to design it at the neckline and cuffs of the sample, so as to make the clothing get a special appearance style, which is refreshing. Especially in the knitting of the formed clothing, the crimping property can also be used to form a unique pattern or split line
3. Pay attention to the looseness of knitted fabrics
Knitted fabrics are different from woven fabrics in style and characteristics. The style of their clothing should not only emphasize the advantages of fabrics, but also overcome their disadvantages. Due to the loose nature of individual knitted fabrics, we should pay attention to the design and production of some knitted fabrics, not to use too much exaggeration, not to design darts and cutting lines, and not to have too many stitches, In order to prevent the breakage of the knitting coil from affecting the wearability of the clothing, the simple and soft lines should be used to coordinate with the soft and suitable style of the knitwear

Divide an equilateral hexagon into six figures of equal size and shape

Of the following figures, those not axisymmetric are
A. There are triangles with equal sides
B. There is a right triangle with an angle of 45 degrees
C. A triangle with three equal interior angles
D. Right triangle with 30 degree angle

The fourth D is the answer
An axisymmetric figure can be symmetrical about a line. From this line, the half figures on the left and right sides are the same. In addition, there is a centrosymmetric figure, but it is a figure about a point and rotated 180 degrees to coincide with the original figure
A. If two sides are equal, then the bisector of the two sides is the axis of symmetry
B. If you have 45 degrees and a right angle, then the other angle is 45 degrees, the same as term a
C. The three angles are equal, that is to say, the three sides are equal, which is also the same as term a

The shape of a wooden box is a cube, with an edge length of 0.8 meters. How many square meters of wood do you need to make this wooden box? There is no cover on the top of the wooden box

Night visit to vampire WB,
0.8 × 0.8 × 5 = 3.2 (M2)

Let a = (COS α, sin α), B = (COS β, sin β), where 0 < α < β < π, if 2A + B = a-2b
Let a = (COS α, sin α), B = (COS β, sin β), where 0

As a result, the vector b = (COS, α, sin α) is (COS β, sin β) and the vector B is b = (COS β, sin β). |a ||| a | B = 1 | 124124124124124\\\124 = 1 \124\ = 1 \\\\\\\\\\\\\\\\\\\π + π / 2 because 0

As shown in the figure, the area of triangle ABC is 16, D is the midpoint of AC, and E is the midpoint of BD. what is the area of quadrilateral cdef?

Connect EC, because D is the midpoint of AC, so s △ abd = s △ BDC = 16 △ 2 = 8, because e is the midpoint of BD, so s △ Abe = s △ AED = 8 △ 2 = 4, s △ BEC = s △ Dec = 8 △ 2 = 4, let s △ CEF = x, then s △ bef = 4-x, s △ ABF: s △ ACF = BF: CF = s △ bef: s △ CEF, namely (4 + 4-x): (8 + x)

A cuboid glass container is 20dm long and 15dm wide, and the water depth in the container is 3.8dm. After a cube iron block with 3DM edge length is put into the container, how much DM does the water surface in the container rise?