单项选择题
平键联结中,标准对平键的宽度规定了( )公差带。
A.1种
B.2种
C.3种
D.4种
平键联结中,标准对平键的宽度规定了( )公差带。
A.1种
B.2种
C.3种
D.4种
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单项选择题
What does the word “regression” (Para. 1, Line 7) most probably mean in this passage?
What does the word “regression” (Para. 1, Line 7) most probably mean in this passage?
A.Forgetting things that happened in the past.
B.Returning to the previous culture shock stage.
C.Leaving the new country for one’s home country.
D. Remembering the good times in one’s home country.