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【单选题】
• 用万用表分别测量b、e极间和b、c极间PN结的正、反向电阻,如果测得正、反向电阻相差较大,这说明三极管( )。A.
• A、良好
B.
B、已经断路
C.
C、已击穿
D.
D、以上答案都不对
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【单选题】When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are. People who are nearsighted can only see things that are...
A.
only when we cannot see perfectly
B.
only when we can see well
C.
even if we can see well
D.
only when we realize how important our eyes are
【单选题】We can see the sun ________ day, but we can't see ________ night. [ ]
A.
in, at
B.
in the, at
C.
in, at the
D.
at, in the
【单选题】. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.
A.
that; what
B.
which; what
C.
that; how
D.
which; how
【单选题】We won’t see any flowers until May .
A.
We will see flowers only in May.
B.
We won’t see flowers after May.
C.
We will see flowers before May.
D.
We will see flowers when May comes.
【简答题】Besides those, what can we see through television? We still can see political______ and the latest exciting ______.
【简答题】When we can see well, we do not think about our eyes often: It is only when we cannot see perfectly that we come to see how important our eyes are. People who are nearsighted（近视的） can only see things ...
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