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【单选题】
当二极管的反向电压增加到某一数值时,反正电流急剧增加,此时的电压称为()。A.
反向饱和电流
B.
正向饱和电流
C.
反向击穿电压
D.
正向饱和电压
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举一反三
【单选题】. With their son ______ a foreign college now, the parents have some financial problems now and then.
A.
to attend
B.
attending
C.
attended
D.
having attended
【单选题】College loans are now much harder to obtain. _________, most college students must work at least part time.
A.
Furthermore
B.
Similarly
C.
Consequently
D.
However
【单选题】Most college students think it ___ suitable jobs now.
A.
difficulty in finding
B.
difficult in finding
C.
difficulty to find
D.
difficult to find
【单选题】When I was at college , I _____ two foreign languages but I _____ most now ..
A.
learnt; had forgotten
B.
learnt ; have forgotten
C.
have learnt ; forgot D have learnt ; have forgotten
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