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【单选题】
一个信号源的电压 U S 为 20 V ,内阻 为 4 K Ω ,通过理想变压器接 负载 R L =40 Ω 。要使负载电阻获得最大功率,则变压器的变比A.
100
B.
20
C.
10
D.
5
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【单选题】How about going to swim this weekend?
A.
Good idea!
B.
He is good at swimming.
C.
Good-bye.
D.
I'm fine.
【简答题】同义句改写。 1. How about going shopping this afternoon? going shopping this afternoon? 2. Even if you are with your friends, it is better not to speak loudly in public places. Even if you are with your fri...
【单选题】How about going for a drive?
A.
It's too fast
B.
a good idea
C.
Yes, let's go by bike
【单选题】How about going shopping?
A.
No, it isn’t
B.
No, let’s go to the library
C.
That’s all right
D.
Thank you
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