皮皮学,免费搜题
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搜题
【单选题】
核酸是由许多核苷酸通过( )化学键连接形成的多聚核苷酸链
A.
肽键
B.
3’,5’-磷酸二酯键
C.
氢键
D.
糖苷键
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A.
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B.
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【判断题】波分复用就是光的频分复用
A.
正确
B.
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A.
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B.
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【单选题】如图所示,在低压配电网中通常用三相四线制供电,就是俗称的三火一零,L1、L2、L3称为火线,N称为零线。那么火线与火线之间的电压为()V
A.
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B.
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A.
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B.
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