Finding the domain of definition of X under the quadratic root of y = sin

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• 1. Ask some English words Have a good time 2 be interested in doing sth 3 sightseeing 4 haircut 5 because And the famous 6 is good at 7 on the east coast 8 uses a lot of his language 9 decides to do something
• 2. Is the function y = xcosx infinite when x → + ∞? Why?
• 3. Why does water change into ice and the quality remains the same Please say why it doesn't change. Please explain in detail. Thank you
• 4. The right figure below is a cross-section of a machine part drawn on a scale of 1:20. What is the actual area of the cross-section? Matter cm
• 5. The length of a machine part is 5 mm, and the cost on the drawing is 4 cm
• 6. As shown in the figure is a cross section of a machine part drawn on a scale of 1:20. Please measure the radii of the two circles in the figure and calculate the actual cross section area of the part
• 7. The actual length of a machine part is 1 mm, and it is 2 cm on the drawing. What is the scale of this drawing
• 8. As shown in the figure, the shadow is 2 / 5 of the area of the big circle and 1 / 3 of the area of the small circle. What is the ratio of the area of the big circle to the area of the small circle
• 9. The area ratio of the shadow part to the blank part of the big circle is 1:6, and the area ratio of the shadow part to the blank part of the small circle is 2:5 The area ratio of the shadow part to the blank part of the big circle is 1:6, and the area ratio of the shadow part to the blank part of the small circle is 2: given that the radius of the big circle is 10 cm, what is the area of the small circle?
• 10. As shown in the figure, the radius of the small circle is 4dm, and the shadow part accounts for 1 / 5 of the area of the small circle and 1 / 8 of the area of the large circle. How many square decimeters is the area of the large circle
• 11. How to remember the Chinese meaning of English words?
• 12. I like your cooking?
• 13. The students go to the park to row boats. There are 60 people in total. They hire 16 boats. The big boat takes 4 people and the small boat takes 2 people. Each boat is full? Hypothesis method, equation method, list method and foot lifting method are all OK,
• 14. Should I be added to the imaginary part of the complex number What is the difference of opinion
• 15. My father often corrects the wrong sentence My father always keeps the style of hard work and plain living
• 16. Given the supply voltage of 220 V sine AC circuit, the current in the circuit is 10 A, and the active power consumption is 1.5 kW?
• 17. The fruit shop has 1800 kg of apples. After 15 days of selling, the weight of the remaining apples is 60% of the weight of pears. How many kg of pears does the fruit shop have?
• 18. A and B trains leave 1050km apart from each other at the same time. A runs 80km per hour. After 2.8 hours, when the two trains are far away from each other, B runs now A and B trains leave 1050km apart at the same time. A trains 80km per hour. After 2.8 hours, the two trains are three fifths of the distance. How many kilometers per hour does a train travel?
• 19. The speed of the car is 70km / h from a to B which is 360km away. Suppose the travel time of the car is t (H), and the distance from B is s (km) The vehicle is driven from a to B with a speed of 70km / h and a distance of 360km. Suppose that the travel time of the vehicle is t (H) and the distance to B is s (km). (1) the function of s with respect to t is written;
• 20. The diameter of a car's outer tire is 9 decimeters, and the wheels roll 1000 cycles per minute. How long does this car advance per hour?