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【单选题】
交流电路中视在功率的单位是()A.
J
B.
W
C.
V·A
D.
var
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【单选题】当温度为 20C 时,二极管的导通电压为 0.7V ,若其他参数不变,当温度升高到 40C 时,二极管的导通电压将( )
A.
等于 0.7V
B.
小于 0.7V
C.
大于 0.7V
D.
不确定
【单选题】— How did you like the lecture tonight? — Very__________.I doubt if I will come to this kind of lecture next time. [ ]
A.
encouraging
B.
encouraged
C.
disappointing
D.
disappointed
【单选题】I was really busy these days, otherwise I _______ to your birthday party last night.
A.
came
B.
did come
C.
should have come
D.
would have come
【单选题】— Did you usually come to school by bike? — _____. But I sometimes walked. [ ]
A.
Yes, I didn't
B.
No, I did
C.
Yes, I did
D.
No, I don't
【单选题】虚拟语气 I did not see your sister at the meeting. If she ____, she would have met my brother A. has come B. did come C. come D. had come
A.
has come
B.
did come
C.
come
D.
had come
【单选题】当温度为 20摄氏度时,二极管的导通电压为0.7V ,若其他参数不变,当温度升高到40摄氏度时,二极管的 导通电压将( )。
A.
等于0.7V
B.
小于0.7V
C.
大于0.7V
D.
与外接电源有关
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