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【单选题】
在上题中该线性网络的开路电压为6V,短路电流为2A,二端网络等效电源的内电阻为( )。A.
1Ω
B.
2Ω
C.
3Ω
D.
4Ω
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举一反三
【简答题】Don't mention your current situation to her when ______ to her. (talk)
【简答题】When I was 14, I left school with learning disabilities and decided to surf the biggest waves in the world, first in California and then in Hawaii. One morning, I met an old man, a bum（流浪汉）, on the st...
【单选题】With respect to a reversing current, slack water occurs when there is ( ).
A.
little or no horizontal motion of the water
B.
little or no vertical motion of the water
C.
a weak ebb or flood current
D.
when winds cause water to back up in a river mouth
【单选题】---- Do you surf the Internet a lot？ ---- Well,_______, I’m too busy with work to surf the Net.
A.
all right
B.
I have no idea
C.
at last
D.
to tell you the truth
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