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夏天暴雨前往往会电闪雷鸣，如果在看到闪电后3s才听到雷声，已知当时气温为25℃，声音在空气中的传播速度为346 m/s，那么闪电处距人约___________m．（不计光的传播时间）

答案

1038

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建筑消火栓给水系统一般由（）、水带、消火栓、消防管道、消防水池、高位水箱和水泵接合器及增压水泵等组成。
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单项选择题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

20（）

A.reconciliation

B.rebellion

C.recreation

D.rehearse
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