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【单选题】
一电阻R上U、I参考方向不一致时,令U=-10V,消耗功率P=0.5W,则电阻R为( )。A.
200Ω
B.
-200Ω
C.
±200Ω
D.
0
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A.
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B.
R
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A.
bride
B.
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C.
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D.
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【单选题】Read each phrase and decide who could say it - the person who makes the call (the caller), or the person who receives the call (the receiver)? 1. Can I help you?
A.
calller
B.
receiver
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