问题
填空题
质量为2 t的汽车，所受阻力是车重的0.2倍，在水平公路上行驶所能达到的最大速度为15m/s，则此汽车发动机的额定功率是 kw．
答案
60
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质量为2 t的汽车，所受阻力是车重的0.2倍，在水平公路上行驶所能达到的最大速度为15m/s，则此汽车发动机的额定功率是 kw．
60
| 阅读理解。 | ||
A.Yes, it's very nice. B. No, but we can breathe it. C. Yes, it has taste. D. No, but we can smell it. 2. What does the underlined word "They" refer to ( 指的是)? A. Wind and air. B. Smell and taste. C. A kite and a plane. D. Wind and clouds. 3. A balloon can lift people up with _________. A. hot air B. soft wind C. smell D. taste 4. What does the poem mainly (主要地) try to tell us? A. We need air sometimes. B. It's hard to stay in the air. C. Air is too little to waste. D. Air is very important to us. |
