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【简答题】
半导体的 性是指往纯净的半导体中掺入某些杂质,导电能力明显改变的特性
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举一反三
【单选题】If a DC motor runs hot, the cause may be _____.
A.
high mica condition
B.
low ambient temperature
C.
clogged ventilation ducts
D.
an open in the shunt field
【单选题】Dear editor, Why do newspapers have so many advertisements for electronic (电子的) equipment? Last Sunday I counted ads. for seven kinds of televisions and thirteen kinds of radios in the Youth Journal. ...
A.
a department star
B.
a shop that sells electronic equipment
C.
a local newspaper
D.
a hotel where the writer stayed
【单选题】In the past few years the school has ______ a lot of money improving the teaching equipment.
A.
cost
B.
paid
C.
spent
D.
taken
【单选题】If a DC motor runs hot, the cause may be ____.
A.
high mica condition
B.
an open in the shunt field
C.
clogged ventilation ducts
D.
low ambient temperature
【单选题】(2011·浙江)Experts think that ________ recently discovered painting may be ________ Picasso.
A.
the；/
B.
a；the
C.
a；/
D.
the；a
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