某钢尺尺长方程式为：ι=30m-0.004m+1.25×10-5×30（t-20℃）

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问题单项选择题

某钢尺尺长方程式为：ι=30m-0.004m+1.25×10^-5×30（t-20℃）m用该尺以标准拉力在20℃时量得直线长度为86.902m，此直线实际长是（）。

A.86.906

B.86.913

C.86.898

D.86.890

答案

参考答案：D

补全对话，情景问答

根据上下文内容补全对话。

A: What did you ____1____ last night?

B: I ___2____ to the movies.

A: ___3___ there many people there?

B: Yes. Most of them ____4____ young people.

A: How did you ___5____ the movie?

B: Very much. It was very ____6____(有趣的). And I ___7____ it very much.

A: What do you think of the actors and actresses?

B: They ____8___ all very good.

A: Which actor did you like ____9____?

B: The actor ___10___ Zhang Ziyi. I liked her very much.

问答题简答题

何为汽轮机的重热现象？