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【简答题】
功率放大器根据电路形式不同分类,可分为变压器耦合功率放大器、单电源互补对称功率放大器(OTL电路)、双电源互补对称功率放大器 (OCL电路)和 放大器。
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【简答题】第三方物流的含义?
【单选题】— Mike, where is Alice? — She is still studying in the classroom. She ______ for three hours. [ ]
A.
study
B.
studied
C.
studies
D.
has been studying
【简答题】Mike says you should ______ your selections if you buy configure-to-order.
【单选题】— Who works______ ,Kate, Alice or Mike?. —Kate works______ than Alice and Mike.
A.
hardest, harder
B.
harder, harder
C.
harder, hardest
D.
hardest, hardest
【简答题】Mike says that in a ______ employees have to trust each people to do their job.
【单选题】—Have you invited Alice to our party? —Yes. But she _____ come; she is busy nowadays.
A.
must not
B.
might not
C.
should not
D.
need not
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