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【判断题】
变位系数x=0的渐开线直齿圆柱齿轮一定是标准齿轮。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】建筑立面图是（）施工的重要依据。
【单选题】Only _____ as an interpreter _____ how important it was to practise spoken English.
A.
when did I work…I realized
B.
when did I work…did I realize
C.
when I work…did I realize
D.
when I worked…did I realize
【简答题】.Only _____ as an interpreter _____ how important it was to practise speaking English. A．when did I work…I realized B．when did I work…did I realize C．when I work…did I realize D．when I worked…did I re...
【单选题】When did the children begin to speak English?
A.
When they are 5 years old.
B.
When they are 6 years old.
C.
When they are 7 years old.
D.
When they are 8 years old.
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