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【单选题】
NPN三极管放大导通必须满足这样的条件，即（）。A.
发射极加正向电压，集电极加反向电压
B.
发射极加反向电压，集电极加正向电压
C.
基极加反向电压，集电极加正向电压
D.
基极加正向电压，集电极加反向电压
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举一反三
【单选题】听力原文： It would seem that there are three kinds of travel books. The first are those that give a personal, subjective account of travels which the author has actually made himself. If they are informat...
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【简答题】已知：如图，在正方形ABCD中，E是CB延长线上一点，EB= 1 2 BC，如果F是AB的中点，请你在正方形ABCD上找一点，与F点连接成线段，并说明它和AE相等的理由． 连接______，则______=AE．
【简答题】But those kinds of plates are not very good for the _ (environment).
【简答题】如图，已知正方形ABCD的面积是 cm 2 ，依次连接正方形的四边中点E、F、G、H得到小正方形EFGH.求这个小正方形EFGH的边长（结果保留两个有效数字）。
【简答题】For those who are almost blind to all colors, what kinds of colors can they only see? They can only see ______.
【单选题】Those kinds of Chinese medicines ______ cool and dry following the instructions. [ ]
A.
must be kept
B.
should place
C.
will be eaten
D.
should carry
【单选题】To my surprise, I never thought I ______ those kinds of books. [ ]
A.
was of benefit to
B.
was beneficial to
C.
benefited from
D.
benefited
【单选题】听力原文： It would seem that there are 3 kinds of travel books. The first are those that give a personal description of travels which the author has actually made himself. If they are informative and have...
A.
2.
B.
3.
C.
4.
D.
5
【简答题】已知：如图，在正方形ABCD中，E、F分别是BC、DC 边上的点，且AE⊥EF于点E。 （1）延长EF交正方形ABCD的外角平分线CP于点P，试判断AE与EP的大小关系，并说明理由； （2）在AB边上是否存在一点M，使得四边形DMEP 是平行四边形？若存在，请给予证明；若不存在，请说明理由。
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