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【单选题】
对于位移电流,下列说法正确的是( )。A.
位移电流由变化电场产生
B.
位移电流由线性变化磁场产生
C.
位移电流的热效应服从焦耳 - 楞次定律
D.
位移电流的磁效应不服从环路定理
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【简答题】嵌入式系统开发采用的交叉开发环境是由 和 组成的。
【简答题】玻尔的氢原子理论是什么?
【单选题】听力原文：M: Mrs. Winter, I need your advice: I want to buy a dress for my wife. Can you tell me where I can get one at a reasonable price? W: Sure. Go to Richard's. It has the latest styles and gives a 30...
A.
It is run by Mrs. Winter's husband.
B.
It hires Mrs. Winter as an adviser.
C.
It gives a 30% discount to all customers.
D.
It encourages husbands to shop on their own.
【简答题】嵌入式系统开发采用的交叉开发环境是由 _______ 和 _______ 组成 。
【单选题】听力原文：M: Mrs. Winter, I need your advice, I want to buy a dress for my wife, can you tell me where I can get one at a reasonable price? W: Sure, go to Richard's. It has the latest styles and gives a 30...
A.
It gives a 30% discount to all customers.
B.
It is run by Mrs. Winter's husband.
C.
It hires Mrs. Winter as an adviser.
D.
It encourages husbands to shop on their own.
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