皮皮学，免费搜题
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【简答题】
三级放大电路中，第一、二、三级的电压增益分别为10dB、90dB、0dB，则总的电压增益为__________ dB。
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皮皮学刷刷变学霸
举一反三
【单选题】Mike pretended ___ Chinese when I came into the classroom.
A.
to reading
B.
reading
C.
to be reading
D.
to be read
【单选题】When I came into the classroom, I saw some girls _______ happily.
A.
cry
B.
talk
C.
to run
D.
laughing
【简答题】She (clean) the window when I came into the classroom.
【单选题】. ．When I came into the classroom , I found him _______ with his study.
A.
occupied
B.
occupying
C.
to be occupied
D.
was occupied
【简答题】用符号“ ¢ ” 或“ ∈ ” 填空: ( 1)−3 N , 0.5 N , 3 N ;
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