皮皮学，免费搜题
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搜题
【单选题】
滤波器能让频率落在其()内的正余弦信号通过。A.
通带
B.
过渡带
C.
阻带
D.
以上都不对
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】If you want to stay safe,you must remember to______.
A.
often wash your hands.
B.
wear a mask when you stay at home.
C.
eat wild animals
【简答题】调节阀的最小可控流量与其泄漏量不是一回事。
【单选题】If you fall into apathy , do you want to (a) change the world, or (b) stay at home and do nothing?
A.
You want to change the world.
B.
You want to stay at home and do nothing.
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