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【简答题】
理想运算放大器的开环放大倍数A U0 为( ),输入电阻为( A. ,输出电阻为 B. A.∞ B.0 C. 不定
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【简答题】HXD3电力机车转向架二系采用()螺旋弹簧。
【单选题】--- I rang you at about ten, but there was no reply. --- Oh, that was probably _____ I was seeing the doctor. [ ]
A.
for
B.
why
C.
when
D.
how
【单选题】－ Must I show you how to operate themachine? － Oh, thank you. I __________ how todo it.
A.
had wondered
B.
would wonder
C.
was wondering
D.
did wonder
【单选题】— Jack and I will celebrate our 20th wedding anniversary next month. — Oh, ________________________
A.
cheer up!
B.
well done !
C.
congratulations!
【单选题】-You were not in when I came over to your house. -Oh, I ____________ for a friend from England at the airport.
A.
was waiting
B.
had waited
C.
am waiting
D.
have waited
【单选题】轻度缺氧时 , 血气分析 PaO2 指标为
A.
10.1--13.33kPa PaO2(lkPa=7.5mmHg)
B.
9.97--12.65 kPa PaO2
C.
6.65--933kPa PaO2
D.
4.66--6.67 kPa PaO2
E.
3.55--4.88 kPa Pao2
【单选题】—How was your job interview? —Oh，I couldn’t feel _______．I hardly found ______ answers to most of the questions they asked．
A.
better，exact
B.
easier，adequate
C.
worse，proper
D.
happier，urgent
【单选题】— I called you yesterday evening, but nobody answered the phone. — Oh, I a walk with my parents at that time.
A.
took
B.
was taking
C.
am taking
D.
take
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