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【单选题】
单相桥式整流,输出电压平均值 U o 与变压器副边交流电压有效值 U 2 之间的关系为( )。A.
U o = 0.45U 2
B.
U o = 0.9U 2
C.
U o = U 2
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【单选题】-Why do you like comedies? -_____________ [ ]
A.
I often watch movies at home
B.
Because I think they're interesting
C.
I like comedies very much
D.
I don't like documentaries
【单选题】On summer nights, I often go to sleep _____ the windows ______. [ ]
A.
with, on
B.
with, open
C.
with, close
D.
let, open
【简答题】什么是视在功率、有功功率、无功功率？
【单选题】---On summer nights the weather is usually very hot. ---Yes, so I often go to sleep ______ the windows ______.
A.
with, on
B.
have, open
C.
with, open
D.
with, closed
【单选题】Bill Frith's garden is larger than Joe's. It is ______.
A.
larger garden
B.
a large garden
C.
large garden
D.
largest garden
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