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【简答题】
P型半导体的多子为 、N型半导体的多子为 、本征半导体的载流子为 。
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反馈参考答案：
举一反三
【简答题】石膏能防火原因?
【单选题】A telephone is an instrument by which we can speak to people far away. The underlined word mean
A.
275. A telephone is an instrument by which we can speak to people far away. The underlined word means ____. A．a tool
B.
an experiment
C.
an expression
D.
an instruction
【单选题】__________ David could remember, he had never said an angry word to that customer.
A.
As far as
B.
As long as
C.
As well as
D.
As much as
【单选题】____ I?know,?there?isn’t?such?a?word?in?English.
A.
As much as
B.
So far as
C.
As long as
D.
As soon as
【单选题】The word 'yet' in line 16 is closest in meaning to
A.
however
B.
since
C.
generally
D.
so far
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