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【单选题】
在单相桥式整流电容滤波电路中,若要求负载电压 U o =18 V,则变压器副边电压有效值 U 2 为( )。A.
20V
B.
40V
C.
18V
D.
15V
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【单选题】What bad weather it was! We decided .A．not to go outB．to go outC．to not go outD．not going out
A.
What bad weather it was! We decided____. A．not to go out
B.
to go out
C.
to not go out
D.
not going out
【单选题】What bad weather it was!We decided . A．to go outB．not to go outC．to not go outD．not going out
A.
What bad weather it was!We decided____. A．to go out
B.
not to go out
C.
to not go out
D.
not going out
【单选题】— What bad weather! The wind is blowing strongly with lots of _____. — I'm sorry to hear that.
A.
sandy
B.
sands
C.
sand
【单选题】What bad weather we have! It has rained _____ the day before yesterday. [ ]
A.
on
B.
in
C.
at
D.
since
【单选题】— What bad weather !It rained again . — Yeah, _____ when you walk to school .
A.
mind you head
B.
Keep of the grass
C.
Watch your step
D.
Be quiet
【单选题】—What bad weather! —Yes. The weather report says it will be even ________ later on.
A.
bad
B.
badly
C.
worse
D.
worst
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