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【单选题】
下列关于PN结的说法中，错误的是（ ）。A.
空间电荷区中电场最强的地方是在靠近N区的边界上
B.
对于单边突变结，空间电荷区宽度主要向低掺杂一侧扩展
C.
平衡时，势垒区两侧正负电荷的总数相等
D.
平衡时，一般假设势垒区自由电子密度为零，采用耗尽层近似
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【单选题】I enjoy my life here. I have _____ friends, and we meet quite often. [ ]
A.
few
B.
a few
C.
little
D.
a little
【单选题】What I want to do most is to have______quite interesting book, and______time to enjoy it.
A.
a the
B.
the the
C.
/ the
D.
a /
【单选题】I quite enjoy painting pictures, ____I know that I do not have what it takes to reach the top
A.
since
B.
unless
C.
if
D.
though
【单选题】It is one thing to enjoy listening to good music, but it is quite ____ to perform skillfully yourself. [ ]
A.
another
B.
other
C.
the other
D.
others
【单选题】What I want to do most is to have____ quite interesting book, and ____ time to enjoy it.
A.
a; the
B.
the; the
C.
不填；the
D.
a; 不填
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