题目内容

In recent years there has been a strong ________ toward the “open classroom”in the elementary schools of the United States.

A. assumption
B. transition
C. program
D. advertisement

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The roads were very busy so traffic ________ along at 10 miles an hour.

A. climbed
B. dashed
C. crawled
D. drift

溢洪道各结构中，控制下泄流量的是（）。

A. 引水渠
B. 溢流堰
C. 泄槽
D. 消力池

轴线与溢流堰轴线平行的称（）。

A. 正槽溢洪道
B. 侧槽溢洪道
C. 井式溢洪道
D. 虹吸式溢洪道

电压的实际方向是什么？