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【单选题】
在图题1.13中 ,已知 ,稳压管的正向导通压降 U D =0.6 V 。 输入电压为负半, 下面说法正确的是( )。A.
D z1 工作在稳压状态， D z2 工作在正向导通， u o =25.6V 。
B.
D z1 工作在稳压状态， D z2 工作在正向导通， u o =24.4V 。
C.
D z1 工作在正向导通， D z2 工作在稳压状态， u o =30.6V 。
D.
D z1 工作在正向导通， D z2 工作在稳压状态， u o =29.4V 。
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【单选题】Spring tides occur_____
A.
when the moon and sun have declination of the same name
B.
at the beginning of spring when the sun is over the equator
C.
only when the moon and sun are on the same sides of the earth
D.
when the moon is new or full
【单选题】The object in the sentence “She wishes to learn English from you” is .
A.
she
B.
English
C.
from you
D.
to learn English from you
【判断题】Punctuation in the sentence: She doesn't like this novel; she is interested in that one.
A.
正确
B.
错误
【简答题】Spring tides occurA. A．when the moon and sun have declination of the same name B. B. at the beginning of spring when the sun is over the equator C. C. only when the moon and sun are on the same sides ...
【单选题】The word “in” in the sentence “She did it while completing the 4-years of high school in 2.” has the same meaning with that in___.( )
A.
She has lived in Beijing for 2 years.
B.
The building was built in 2001.
C.
She put her suitcase in her cabinet.
D.
I finished the test in 30 minutes.
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