圆柱蜗杆传动正确啮合的条件是:1、;2、 ;3、 。
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Bid farewell to sb 是什么意思
A. 拜拜
B. 谢谢
C. 告别某人
D. 祝福某人
飞行愉快用英语如何表达
A. Have a nice journey.
B. Take care of yourself.
C. nice to meet you.
D. Have a good flight.
祝您旅途愉快如何翻译呢
A. Have a nice trip.
B. Have a pleasant trip.
C. Have a good flight.
D. I wish you a pleasant journey.