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纠错
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【判断题】
零件的尺寸公差等级越高,则该零件加工后表面粗糙度参数值愈小,由此可见,表面粗糙度参数值要求很小的零件,则其尺寸公差值亦必定很小。
【判断题】
表面粗糙度对零件的耐磨性影响很大。因此,无论什么条件下,为提高零件的耐磨性,应尽量降低零件的表面粗糙度。
【判断题】
在相同表面粗糙度的情况下,用线切割加工的零件的耐磨性比机械加工的好。
【单选题】
?100圆柱右端的环形表面粗糙度Ra值为
【单选题】
加工中心加工时,零件一次安装应完成尽可能多的零件表面加工,这样有利于保证零件各表面的( )。
【单选题】
甲乙两个车间工人日加工零件数的均值和标准差如下:甲车间:=70件,=5.6件,乙车间:=90件=6.3件,哪个车间日加工零件的离散程度较大()
【单选题】
甲乙两个车间工人日加工零件数的均值和标准差如下:甲车间:=70件,=5.6件,乙车间:=90件,=6.3件,哪个车间日加工零件的离散程度较大()
【单选题】
He is a doctor of().
【单选题】
He raised his voice to an even higher() .
【单选题】
Young kids are always filled with enormous ( ) about almost everything, which sometimes leads them to danger.
【单选题】
The old couple, whose kids have all passed away, have to ( ) only with their small pensions.
【单选题】
His handsome look, elegant taste, manners of gentleman, and ( ) knowledge in history and economy all intoxicated his pupils.
【单选题】
Bank of China has ( ) the other rivals by raising its offer.
【单选题】
The leakage of the concrete ( ) of the contract between the two corporations has aroused much concern and a heated discussion in local residents.
【单选题】
A ( ) is a second-year student in college, which means “student with more wisdom”.
【单选题】
Initiative and spirit of ( ) are two key elements that ensure the rapid but steady progress of the corporation.
【单选题】
Nancy ( ) the egg over in the pan