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【简答题】
图示电路是收音机的接收电路，各地电台所发射的无线电波在天线线圈中分别产生各自频率的微弱的感应电动势e1、e2、…，调节可变电容器，使某一频率的信号发生串联谐振，从而使该频率的电台信号在输出端产生较大的输出电压，以起到选择收听该电台广播的目的。已知L=0.25mH，C 在40~350pF之间可调，则可收听的频率范围为 kHz。（2分） 【图片】
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A.
what
B.
as
C.
which
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that
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A.
正确
B.
错误
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A.
what
B.
as
C.
which
D.
that
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A.
what
B.
which
C.
as
D.
that
【单选题】I agree to the idea _______ our staff should use recycled papaer to save money.
A.
what
B.
which
C.
that
D.
as
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