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【判断题】
在PN结形成过程中，载流子扩散运动是浓度差作用下产生的。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】– What happened to Tom in the accident? – Carelessness him his left leg.
A.
spent
B.
took
C.
paid
D.
cost
【单选题】What happened to Tom?
A.
He was lost.
B.
He w as picked up by a policeman.
C.
His brother was found.
【单选题】— What happened to Tom yesterday? — Well, he was walking in the street when a stone flew up and hit _______.
A.
him in the head
B.
him in his head
C.
him on the head
D.
the head
【简答题】听下面一段材料, 回答第1至4题. 1. What happened to Tom? A. He had a traffic accident. B. He hit a truck yesterday. C. He hurt his head seriously. 2. What do we know about the truck driver? A. He wasn't badly hurt....
【单选题】— What happened to Tom? — He was crossing the street ____ a motorbike hit him from behind. [ ]
A.
while
B.
when
C.
until
D.
because
【单选题】What happened to Tom?
A.
He got injured.
B.
His bicycle is stolen.
C.
His bicycle fell.
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