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问题 问答题

某电路两端的电压为12V且保持不变，若通过电路的电流为1.5A时，电路中的电阻为多少？若使电路中的电流减少到0.5A，则应再串联一个多大阻值的电阻？

答案

（1）R=

U
I
=
12V
1.5A
=8Ω；

答：电路中的电阻为8Ω．

（2）R总=

U
I总
=
12V
0.5A
=24Ω，

R串=R总-R=24Ω-8Ω=16Ω．

答：应再串联一个阻值为的16Ω的电阻．

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) .

19（）

A.blunder

B.temptation

C.break

D.trait
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单项选择题

研究表明，人体对（）有较强的吸收能力。

A.可见光

B.近红外线光

C.远红外线光

D.紫外线光
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