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问题 问答题

某时刻LC回路中电容器中的电场方向和线圈中的磁场方向如右图所示．则这时电容器正在______（充电还是放电），电流大小正在______（增大还是减小）．

答案

用安培定则可知回路中的电流方向为逆时针方向，而上极板是正极板，所以这时电容器正在充电；因为充电过程电场能增大，所以磁场能减小，电流在减小．

故答案为：充电；减小．

多项选择题

本预规作为电网工程（）的编制和费用计算依据，应与电力工程投资估算指标、概算定额、预算定额和工程量清单计价规范配套使用。

A.投资估算

B.初步设计概算

C.施工图预算

D.工程量清单

E.工程价款结算
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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) .

（10）（）

A.distinctive

B.turbulent

C.spontaneous

D.healthier
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