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问题 单项选择题

同上题，自然进风量Lzj为( )m3/s。

A．0.87

B．0.78

C．0.71

D．0.52

答案

参考答案：D

解析：
上题中，两式联立求解，同时可求得：Lzj＝0.52m3/s

完形填空

第二节：语法填空（共10小题，每小题1.5分，满分15分）

阅读下面短文，根据上下文在空白处填上适当的词, 或使用括号中的词语的正确形式填空。

We high school students do have some growing pains, but we can get rid of them correctly and wisely.  31           , some of us are upset  32            their body styles and looks. It’s unnecessary and it’s not important at all. We needn’t care about it. It is one’s inner beauty   33           matters. Second, we sometimes seem to be misunderstood     34             our teachers, parents and classmates.    35        (face) with this, we can find a proper time to have a heart-to-heart talk with them, trying to remove the    36                (understand). Some of us have fewer friends. I think being open-minded and friendly will do you good. Third, we may fall behind others,  37           __ makes us stressed. Actually we can encourage    38             to work  39            (efficiency), full of determination. At last, some of us don’t have much pocket money, so they feel unhappy. Isn’t it strange? So long as we have some, that’s enough. And we can learn  40        to spend money.
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填空题

差动保护的缺点是：对变压器内部不严重的（）短路故障，反映不够（）。
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