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问题 单项选择题

烟道挡板两个轴套的安装焊接应保持（），并垂直于烟囱的轴线。

A、平直

B、平行

C、同心

D、一定倾角

答案

参考答案：C

选择题

一物体从H高处自由下落，经时间t落地，则当它下落

t
2
时，离地面的高度为（　　）

A．

H
2

B．

H
4

C．

3H
4

D．

3H
2
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选择题

The government tried its best to _____ the people’s needs, but the people were still not_________. In fact, what the government did was not___________.

A．satisfy; satisfied; satisfying

B．satisfy; satisfying; satisfied

C．satisfied; satisfied; satisfying

D．satisfying; satisfied; satisfied
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