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【多选题】
为什么没有接地线机箱会带电,以下解释正确的是A.
“漏电流”很小几乎为零,所以不会对人体造成“电击”的危险,但会有“电击”的感觉
B.
市电供电没有地线
C.
经过国家强制3C认证的电脑电源,必须加入EMI滤波电路
D.
滤波电路目的是滤除电网中高频脉冲对电源的干扰,但不能滤除电源自身对外界产生的电磁干扰
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皮皮学刷刷变学霸
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【单选题】One day a farmer bought four donkeys at the market place in the village. He got【56】the back of one of【57】and began to tide home.【58】he was riding along, he noticed that【59】were only three donkeys walk...
A.
to
B.
at
C.
on
D.
for
【简答题】When George was thirty-five, he bought a small plane and learned to fly it. He soon became very good and made his plane do all kinds of tricks (特技). George had a friend, whose name was Mark. One day ...
【简答题】Intellectual property (IP) is a product of the mind that has commercial value. The concept dates back to 1623 when the first patent law to protect IP sights was passed. IP rights protect the artist fr...
【简答题】按照构成要素分类，标志可分为图形标志、文字标志和文字与（）。
【简答题】阅读理解。 My parents were in a huge argument, and I was really upset about it. I didn't know who I should talk with about how I was feeling. So I asked Mom to allow me to stay the night at my best friend'...
【简答题】标志因题材、创作形式及应用范围而多种多样,按构成要素的表现形式可分为( )、( )和( )三种。
【单选题】At first glance, there hardly seems to be any comparison between Ravenna and Rome, but back in the 5th century, it was Ravenna that served as capital of the Western Roman Empire. In this city, Roman r...
A.
display artistic achievements
B.
compete with Roman paintings
C.
explain religion and politics
D.
teach reading and writing
【简答题】完形填空。 Having said goodbye to his parents, Alvin, with his wife and one-year-old son, set off back home. 1 excited, Alvin and Clare talked and laughed happily. And even little Alax 2 from time to time....
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