问题
选择题
| 关于功率说法正确的是（ ） A．由P=W/t知，只要知道W和t就可求出任意时刻的功率 B．由P=W/t知，P与W成正比，与t成反比 C．从P=Fv知，汽车的功率与它的速度成正比 D．从P=Fv知，当汽车发动机功率一定时，牵引力大小与速度的大小成反比 |
答案
答案：D
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| 关于功率说法正确的是（ ） A．由P=W/t知，只要知道W和t就可求出任意时刻的功率 B．由P=W/t知，P与W成正比，与t成反比 C．从P=Fv知，汽车的功率与它的速度成正比 D．从P=Fv知，当汽车发动机功率一定时，牵引力大小与速度的大小成反比 |
答案：D
| 完形填空。 | ||||
| Wu Yang gets 1 late. He rides his bike to the school quickly. He doesn't look 2 the traffic (交通) lights, so he hits (撞) a 3 . The driver 4 him to hospital right now. The doctor looks over Wu Yang very carefully (仔细地). Wu Yang wants to go to 5 but the doctor and the driver 6 him to stay in bed. "Now my boy," says the doctor. "Could you 7 me your name, please?" "What are you going to do?" asks Wu Yang. "I'm going to tell your parents and your 8 ." answers the doctor. "But my parents 9 my name and my teacher knows my name, 10 ." says Wu Yang. | ||||
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