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【单选题】
某一有源二端线性网络如图7.1-21（a）所示。该网络的戴维南等效电路如图7.1-21（b）所示，其中US和RS取值为（）。A.
6V，6Ω
B.
6V，2Ω
C.
12V，6Ω
D.
12V，2Ω
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举一反三
【单选题】Thinking is any mental activity that helps us _________ or solve a problem, make a decision, or fulfill a desire to understand.
A.
duplicate
B.
simulate
C.
formulate
D.
verify
【简答题】In many American families, parents feel that children should make important decisions ________. A) to themselves B) on themselves C) of themselves D) by themselves
【简答题】The member countries of the UN and its specialized agencies give guidance and make decisions on______in regular meetings held throughout each year.
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