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【单选题】
生产中采用变位齿轮传动不能 。A.
避免齿轮根切
B.
使设计计算简单，加工、检验方便，互换性好
C.
提高齿轮的承载能力
D.
配凑中心距
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反馈参考答案：
举一反三
【单选题】—John, how old is your grandfather? —_______ We had a party for his _______ birthday last week. [ ]
A.
Eighty; eightieth
B.
Eighty; eighty
C.
Eightieth; eighty
D.
Eightieth; eightieth
【单选题】Barry had an advantage over his mother ______ he could speak French.
A.
since that
B.
in that
C.
at that
D.
so that
【简答题】How old was John Reed?
【单选题】一How old is your little brother．John? 一Today is his ________birthday．He is _______years old． [ ]
A.
ten；tenth
B.
ten；ten
C.
tenth；tenth
D.
tenth；ten
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