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【单选题】
典型的差分放大电路中 Re()A.
对差模信号起抑制作用
B.
对共模信号起抑制作用
C.
对差模信号和共模信号均无作用
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举一反三
【单选题】Glass ionomer cements are composed of( )
A.
zinc oxide powder and polycarboxylic
B.
zinc oxide powder and phosphoric acid liquid
C.
aluminosilicate powder and phosphoric acid liquid
D.
aluminosilicate powder and polycarboxylic liquid
【单选题】In mixing zinc phosphate cement，which clinical variable has the greatest effect on the strength of the cement( )
A.
spatulation time
B.
liquid-powder ratio
C.
temperature ofthe mixing slab
D.
number and size ofpowder increments
【单选题】My father has worked there ___________.
A.
since five year
B.
since 1990
C.
for five years ago
D.
five years
【简答题】有“现代组织理论之父”之称的是( )
【单选题】My father has worked there ___________.
A.
since five years
B.
since 1990
C.
for five years ago
D.
five years
【单选题】The building has ______ floors and I live on the ______ floor. [ ]
A.
five; five
B.
five; twelfth
C.
twelve; twelve
D.
twelve; fifth
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