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【单选题】
锁相环中的环路滤波器是一个（ ）A.
低通滤波器
B.
滤波器
C.
带通滤波器
D.
带阻滤波器
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①③
B.
①④
C.
②③
D.
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【单选题】听力原文： We've become alarmed over the health center by the number of students who are experiencing hearing loss. First, I want to go over some basic about hearing. Then we can take a look at our school ...
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D.
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