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Measuring range of mercury thermometer What is the thermometer that can measure the temperature in all parts of the country
If we want to use the same thermometer to measure the air temperature in all areas of the country, mercury thermometer is definitely not good. We should use alcohol thermometer (the upper limit of measurement under standard atmospheric pressure is not more than 78.3 ℃), platinum resistance thermometer or semiconductor thermometer as the sensitive element. The measurement range and accuracy of the latter two are better than alcohol thermometer, especially platinum resistance thermometer can be used as the standard measuring instrument
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- 1. There is a thermometer whose mercury surface is at 38 degrees Celsius. Xiaoming measured the temperature of the sick students without throwing it away. The result is There is a thermometer whose mercury surface is at 38 ℃. Xiao Ming measured the body temperature of the sick students without shaking. The results showed that the first time was 39.5 ℃, the second time was 39.5 ℃, and the third time was 39 ℃ A only the first time is right B only the third time is incorrect C is correct only for the third time The third time must be right, and the first time may be right Please give reasons
- 2. How to use scientific calculator to calculate sin20 ° 21 ′ 43 ″, sin20 ° 17 ′ 30 ″, sin19 ° 10 ′ 42 ″
- 3. () () 7 times () equals 29 () 3 find out what () should be
- 4. 1. Given that two circles x square + y square = 10 and (x-1) square + (Y-3) square = 20 intersect at two points a and B, then the equation of line ab_______ ? 2. The two points P and Q on the circle x + square y + square x-6y + 3 = 0 originate from the symmetry of the straight line kx-y + 4 = 0, then K=__ ? 3. The equation of circle with the diameter of the line segment between the two coordinate axes of the line 3x-4y + 12 = 0_____ ?
- 5. The problem of the vertical relation of the solid geometry in the second grade of senior one What is the vertical line of a plane, what is the vertical plane of a straight line, what is the vertical foot, what is the vertical line segment, and what is the distance from this point to the plane?
- 6. 2,4,5 of a year's mathematical knowledge summary, the best is the network diagram, OK, I give 100 points ～ If it is a summary, do not need the network, and, do not test questions, to summarize
- 7. Given that the length of the line L is 5 when it passes through P (3,1) and is cut by two parallel lines l1x + y + 1 = 0l2x + y + 6 = 0, the equation of L is obtained Find out the angle between L and L1, L2 as α = 45 degrees, then know KL is 1, and then calculate it in oblique form. Why is my answer wrong
- 8. 1. Find the linear equation that passes through the point a (- 2,2) and the area of the triangle enclosed by two coordinate axes is 1 2. If the line 3ax-y-1 = 0 is perpendicular to the line (A-2 / 3) x + y + 1 = 0, find the value of M 3. If the line ax + y + 2 = 0 intersects with the line segment connecting a (- 2,3) and B (3,2), find the value range of A The second problem is a
- 9. A machine has three gears, a and B mesh, C and B mesh, a and C do not mesh. If the diameter of a wheel is 200cm, the diameter of B wheel is 120cm, the diameter of C wheel is 250cm, and the angle a is 45 degrees, try to establish an appropriate coordinate system, and use the coordinate method to calculate the center distance of a and C wheels (accurate to 1cm)
- 10. Given that the first term A1 of sequence an = radical 2, a (n + 1) = radical (2 + an), find the general term formula of sequence an The teacher's teaching method is to assume that an = 2cos (θ n) θ n ∈ (0,90 °) So, 2cos θ (n + 1) = radical (2 + 2cos (θ n)) = 2cos (θ n / 2) is obviously wrong... Isn't the half angle formula like this? In this case, we can't go on... What's wrong with this idea? How can we go on with this idea?
- 11. The mercury of the thermometer is 38.5 degrees centigrade. When a student is not shaking it The mercury of the thermometer is at 38.5 degrees centigrade. If a student directly measures two patients with 36.5 degrees centigrade and 40 degrees centigrade without shaking, the readings of the thermometer are? A36 ℃ and 40 ℃, B is 40 ℃, C is 38.5 ℃, d38.5 ℃ and 40 ℃
- 12. The temperature range is between 38.9 ℃ and 41.1 ℃
- 13. 18.8 degrees centigrade?
- 14. 8 degrees below zero
- 15. How much temperature should be taken to reduce the body temperature? A.35 ℃, b.36 ℃, c.37 ℃, d.38 ℃ and e.35 ℃
- 16. Tan20 ° + tan40 ° + three times of tan20 ° × tan40 ° =?
- 17. Evaluation: 4sin40 ° - tan40 °
- 18. 4cos50°-tan40°=______ ．
- 19. 4cos50°-tan40°=______ ．
- 20. How much is Tan 40? It's a fraction