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【单选题】
下列对霍尔效应描述正确的是（）A.
当两作用力不相等时电荷不再向两边积累，达到动态平衡
B.
在磁场中导体自由电子在磁场的作用下做定向运动。每个电子受洛仑兹力作用被推向导体的另一侧,在两个侧面形成霍尔电场E H
C.
任何材料在一定条件下产生霍尔电势，所以都可以制造霍尔元件
D.
霍尔现象是美国物理学家霍金（1855—1938）于1859年在研究金属的导电机构时发现的
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【单选题】What are you going to do for your year abroad, Tim.-----Study study study! ______
A.
Sounds hard
B.
Very good.
C.
I want to learn a lot.
D.
It is my pleasure.
【简答题】上传本工程电气部分模型。
【单选题】---What do you think of the waiter over there? ---I don’t think he is a qualified one. Hewas talking __________ while taking my order.
A.
with a phone
B.
on the phone
C.
about a phone
D.
by the phone
【单选题】---What do you think of the waiter over there? -I don’t think he is a qualified one. He was talking __________ while taking my order.
A.
by the phone
B.
with a phone
C.
on the phone
D.
about a phone
【简答题】Exercise three 1. What do you know about winter 1962-3? It is the winter since at least 1795 2. What is the weather like on February 6-7, 1963? It continuously for 36 hours 3. What is the average temp...
【简答题】根据对话内容，选择正确的句子，将其序号填入横线上，补全对话。 A. It's next to the cinema. B. What are you going to do after English class? C. Then walk straight for five minutes. D. Get off at the hospital. E. Where is the bookstor...
【单选题】在80x86中可屏蔽中断请求被CPU响应的条件是（）。
A.
INTR引脚有中断请求，NMI引脚没有中断请求，系统没有DMA请求
B.
CPU当前指令执行完毕
C.
中断允许标志IF=1
D.
以上条件都包括
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