圆形断面钢材,同一截面上出现两个直径不等的现象,这两个直径的差值叫()。
A. 公差
B. 不圆度
C. 正偏差
D. 负偏差
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在编写螺纹加工程序时,必须考虑引入、引出距离,以保证螺纹的中径尺寸恒定。
A. 正确
B. 错误
心脏骤停的诊断标准:__________、__________、_________、___________、___________、__________。
手提灭火器宜设置在挂钩、托架上和灭火器箱内,其顶部离地面高度应小于()m。
A. 1.2
B. 1.3
C. 1.4
D. 1.5
Your products()so well here but for a lot of advertisements we have done on television and in newspapers.
A. would not have been sold
B. won’t sell
C. would not sell
D. have not been sold