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【单选题】
下列不属于SSB接收机的组成电路是( )。A.
输入选频电路
B.
检波电路
C.
频率合成器
D.
激励器
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反馈参考答案：
举一反三
【单选题】John spent most of his time practising speaking English in addition _____ his spare time. [ ]
A.
of
B.
to
C.
for
D.
into
【单选题】The professor, ________ his assistants, _______ conducting the experiment.
A.
in addition, is
B.
as well, is
C.
in addition to, are
D.
as well as, is
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