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零件的表面状态是指零件表面的（）等。①粗糙度；②加工质量；③形貌；④应力状态；⑤成分和性能的变化。

A. ①②④
B. ①④⑤
C. ①③④
D. ②③⑤

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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

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I haven't been to New York before and_______.

A. neither has my sister
B. neither my sister has
C. I has not loo
D. my sister has not also

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

A. do I meet
B. had I met
C. I met
D. I had met

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

A. If electric computers would not have been invented
B. Had electric computers not invented
C. Had electric computers not been invented
D. If electric computers were not invented

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零件的表面状态是指零件表面的（ ）等。①粗糙度；②加工质量；③形貌；④应力状态；⑤成分和性能的变化。

A. ①②④ B. ①④⑤ C. ①③④ D. ②③⑤

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。

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.

零件的表面状态是指零件表面的（）等。①粗糙度；②加工质量；③形貌；④应力状态；⑤成分和性能的变化。

A. ①②④
B. ①④⑤
C. ①③④
D. ②③⑤

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。