如图所示,自耦变压器输入端A、B接交流稳压电源,其电压有效值UAB=100V,R

题型:填空题

问题:

如图所示,自耦变压器输入端A、B接交流稳压电源,其电压有效值UAB=100V,R0=40Ω,当滑动片处于线圈中点位置时,C、D两端电压的有效值UCD为______V,通过电阻R0的电流有效值为______A.

考点:变压器的结构和原理
题型:填空题

跳合闸引出端子应与正电源适当隔开。

题型:填空题

单词拼写。

1. Please help ________ (你自己) to some fish, Tom. Don't be so shy.

2. Man can't live ________ (没有) water, so we must make good use of it.

3. Please listen to the speaker ________ (仔细地) when he (she) speaks.

4. She is such a pleasant and ________ (有帮助的) girl that we all like her.

5. The foreign teachers in our school are from Germany, they are ________ (德国人).

6. December is the t________ month of a year, New Year's Eve is coming.

7. P________ are lovely animals and they live mainly in Sichuan province.

8. My brother wants to i________ all his friends to his birthday party next week.

题型:填空题

以下哪些属于客户购车的原则()

A.经济能力的原则

B.用途决定车型的原则

C.使用维修方便原则

D.个人喜好原则

题型:填空题

我们要保护海草床的原因不包括()

A.海草床生物系统有很高的直接经济价值

B.海草床生物系统能净化海水

C.海草床为水生生物提供了生存场所

D.海草床为海马等海洋生物提供栖息场地

题型:填空题

典型的定位系统有哪些?

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