题目内容

零件材料的疲劳强度的大小受到内部因素的影响，主要指零件的（）等。①材料成分；②毛坯缺陷；③表面应力状态；④应力集中；⑤表面加工质量。

A. ①②③
B. ①③⑤
C. ①②③④
D. ①②④

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零件材料的疲劳强度的大小受到内部因素的影响，主要指零件的（ ）等。①材料成分；②毛坯缺陷；③表面应力状态；④应力集中；⑤表面加工质量。

A. ①②③ B. ①③⑤ C. ①②③④ D. ①②④

I haven't been to New York before and_______.

Never____ such a good boss before I came to this cotmpany.

__________, many problems of space flight could not be solved now.

Busy ___he is ,he can fulfill the task ahead of the schedule.

零件材料的疲劳强度的大小受到内部因素的影响，主要指零件的（）等。①材料成分；②毛坯缺陷；③表面应力状态；④应力集中；⑤表面加工质量。

A. ①②③
B. ①③⑤
C. ①②③④
D. ①②④