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【简答题】
PN结形成的过程中,P型半导体中的多数载流子由( )( )扩散,N型半导体中的多数载流子由( )( )扩散。扩散的结果使它们的交界处建立起一个( ),其( )区指向( )区。
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皮皮学刷刷变学霸
举一反三
【单选题】下列不属于比例控制规律的优点的是()
A.
反应快，控制及时有效
B.
放大系数越大，比例度越小，系统的稳定性越差
C.
放大系数越大，比例度越小，控制作用越强
D.
过渡过程结束的时候，被控变量不存在余差。
【多选题】数量验收时,在下列情形下可进行抽验检验( )
A.
对于数量大而包装规格划一的物料
B.
固定包装的小件物料
C.
按件标明重量或数量的物料
D.
按理论换算而规格整齐划一的物料
【简答题】Jean doesn’t want to work right away because she thinks that if she __________ a job she probably wouldn’t be able to see her friends very often. A) has to get B) were to get C) had got ...
【单选题】Merv: Are these your sons, Jean? I haven't seen them for ages. Jean: Yes, that photo was taken a few months ago. Merv: John hasn't changed a bit. He's the very image of his father, isn't he? Jean: Yes...
A.
He takes up with his father.
B.
He really likes his father.
C.
He looks after his father.
D.
He takes after his father.
【简答题】JDK提供了一个专门用来操作集合的工具类,这个类是【】
【单选题】After a second thought, Jean a better method to deal with the problem.
A.
put up with
B.
came up with
C.
added up to
D.
made up for
【简答题】民俗形成的原因有哪些?主要有哪些基本特征?
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