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【判断题】
在零件图中,对零件的表面质量提出的精度要求称作表面结构,表面结构是表面粗糙度、表面波纹度、表面缺陷、表面纹理和表面几何形状的总称()A.
正确
B.
错误
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【简答题】完形填空。 I was sure that I was to be killed. I became terribly nervous. I searched in my pockets to see if there were any cigarettes, which had 1 their search. I found 2 and because of my shaking hands, ...
【单选题】口服避孕药，少数妇女出现类似早孕反应等症状的原因是( )
A.
自主神经功能紊乱
B.
雌激素刺激胃黏膜引起
C.
避孕失败后怀孕的早孕反应
D.
机体对药物的排斥反应
E.
感冒所致
【简答题】I was sure that I was to be killed. I became terribly nervous. I fumbled (searched) in my pockets to see if there were any cigarettes, which 1 their search. I found 2 and because of my shaking...
【单选题】I searched for my wallet and it wasn't thereI thought I______it at home.
A.
left
B.
have left
C.
might have left
D.
could have left
【简答题】完形填空。 I was sure that I was to be killed. I became terribly nervous. I fumbled (searched) in my pockets to see if there were any cigarettes, which 1 their search. I found 2 and because of my shaking h...
【单选题】I have searched my mind______vain for a polite way to tell that reader to go to hell.
A.
at
B.
in
C.
on
D.
to
【单选题】双反星形可控整流电路整流变压器,表述正确的是:
A.
双反星形为两组三相半波并联，且需用平衡电抗器，每组三相半波整流电路各承担负载平均电流的1/2，整流变压器不存在直流磁化现象。
B.
双反星形为两组三相半波并联，且需用平衡电抗器，每组三相半波整流电路各承担负载平均电流的1/2，但整流变压器存在直流磁化现象。
C.
双反星形为两组三相半波并联，且需用平衡电抗器，每组三相半波整流电路各承担负载平均电流的1/2，不需要整流变压器。
【单选题】某书店管理系统使用(书号,书名,作者,出版社,出版日期,库存数量......)一组属性来描述“图书”,宜选(59)作为主键。
A.
书号
B.
书名
C.
作者
D.
出版社
【单选题】某书店管理系统用(书号,书名,作者,出版社,出版日期,库存数量......)一组属性来描述“图书”,宜选____作为主键。
A.
书号
B.
书名
C.
作者
D.
出版社
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