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【单选题】
最大功率Pmax公式中，Uoc和Rs分别指的是A.
有源二端网络开路电压的有效值，有源网络戴维南等效阻抗的实部
B.
有源二端网络开路电压相量，有源网络戴维南等效阻抗的实部
C.
有源二端网络开路电压的有效值，有源网络戴维南等效阻抗的虚部
D.
有源二端网络开路电压的有效值，有源网络戴维南等效阻抗的模
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皮皮学刷刷变学霸
举一反三
【单选题】Grammar practice:I’ve had ______bad headache all day, so I think I’ll go to _______bed early.
A.
a; /
B.
/; the
C.
/; /
D.
a; the
【单选题】M: I’m a little tired, so I think I’ll go to the Students Lounge and listen to a little music. Care to join me? W: I’d love to, but I have to go to the library and read a book. The exam is coming. Why...
A.
She’s a little tired.
B.
She wants to listen to music.
C.
She is going to study.
D.
She is going to have an exam that afternoon
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