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【单选题】
ZPW—2000A型无绝缘轨道电路室内设备包括发送器、（ ）和电缆模拟网络。
A.
调谐单元
B.
匹配变压器
C.
空心线圈
D.
接收器
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A.
正确
B.
错误
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C.
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A.
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D.
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【单选题】He talked a lot about things and persons _______ they remembered in the school.
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which
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whom
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