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问题 选择题

在平直公路上有甲、乙两辆汽车沿着同一方向做匀加速直线运动，它们的运动速率的平方随位移的变化图象如图所示。则以下说法正确的是

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A．甲车的加速度比乙车的加速度大

B．乙车的加速度比甲车的加速度大

C．两车经过s0位置前运动的时间相同

D．在s0位置甲、乙两车再次相遇

答案

答案：A

填空题

单词拼写。

1. We have a large _____ (系统) of railways.

2. The new method he suggested sounded good in _____ (理论), but it was not practical in use.

3. The boat sank in a _____ (猛烈的) storm at sea.

4. She is _____ (不像) her mother; she is tall and her mother is very short.

5. Efficiency would be _____ (增加) several times.

6. Wide differences of character _____ (存在) even in children of the same family.

7. What _____ (使迷惑) me is why they did not show up.

8. The truck _____ (碰撞) into the wall.

9. Don't always _____ (依靠) on others. You should learn to rely on yourself.

10. My new teacher is both _____  (温和的) and encouraging toward me.

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多项选择题

货币时间价格的一般表现形式从绝对量看就是一种（）。

A.估算成本

B.估计成本

C.机会成本

D.标准成本

E.可控成本
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