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【判断题】
集成运算放大器的内部电路一般采用直接耦合方式，因此它只能放大直流信号，而不能放大交流信号。A.
正确
B.
错误
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举一反三
【单选题】—I visited China year. —That interesting.
A.
should have been
B.
can be
C.
must be
D.
must have been
【单选题】If I______more careful, such mistake could have been avoided.
A.
are
B.
have been
C.
would be
D.
had been
【简答题】指出循环热效率公式 η =1-Q2/Q1和 η =1-T1/T2 各自适用的范围 (T1 和T2 是指冷源和热源的温度 )
【单选题】I would have grabbed the ball if I closer to it.
A.
was
B.
were
C.
would be
D.
had been
【单选题】I would have gone to visit him in the hospital had it been at all possible, but I ______ fully occupied the whole of last week.
A.
were
B.
had been
C.
have been
D.
was
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