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【单选题】
如某晶闸管的正向阻断重复峰值电压为745V,反向重复峰值电压为825V,则该晶闸管的额定电压应为()A.
700V
B.
750
C.
800V
D.
900V
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举一反三
【简答题】下列反应的 Q p 和 Q V 有区别吗? ( 1 ) 2H 2 (g)+O 2 (g)=2H 2 O(g) ( 2 ) NH 4 HS(s) = NH 3 (g)+H 2 S(g) ( 3 ) C(s)+O 2 (g)=CO 2 (g) ( 4 ) CO(g)+H 2 O(g)=CO 2 (g)+H 2 (g)
【单选题】You __phone him if you want to, but you__. He'll surely phone you.
A.
may; mustn’t
B.
have to; needn't
C.
might; won’t
D.
can; needn’t
【简答题】A．It is interesting. B．It is boring. C．It is exciting. D．It is challenging.
【单选题】If you want to go to the movies, you can phone to ___.
A.
make an appointment
B.
ask for a reduced price
C.
know what's on and when
D.
pay for a ticket
【简答题】人们用“沉鱼落雁,闭月羞花”指代表中国古代四大,其中“沉鱼”指的是 。 “落雁”指的是 。 “闭月”指的是 。 “羞花 ”指的是 。(名字间请用空格隔开)
【单选题】What does the man think of the play?
A.
It is interesting.
B.
It is not interesting.
C.
It is good.
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