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【单选题】
关于直流稳压电源说法的是( )。 A. 直流稳压电源只包含降压环节。 B. 直流稳压电源包含降压、整流环节。 C. 直流稳压电源包含降压、整流、滤波环节。 D. 直流稳压电源包含降压、整流、滤波、稳压环节。A.
B.
C.
D.
D
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反馈参考答案：
举一反三
【单选题】It is said that the library being built at present will be _______ what it used to be.
A.
twice as big as
B.
twice big than
C.
twice as much as
D.
twice much than
【单选题】The newly-built library is a ______ building.
A.
five-storey
B.
f ive storeys
C.
f ive-storey's
D.
f ive storeys'
【简答题】afraid [ə'freɪd]
【单选题】The new-built library is a_____ building .
A.
five-storey
B.
five storeys
C.
five-storey’s
D.
five storeys’
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