题目内容

单头蜗杆主要用于；多头蜗杆用于。

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A. 拜拜
B. 谢谢
C. 告别某人
D. 祝福某人

A. Have a nice journey.
B. Take care of yourself.
C. nice to meet you.
D. Have a good flight.

A. Have a nice trip.
B. Have a pleasant trip.
C. Have a good flight.
D. I wish you a pleasant journey.

A. 接受
B. 招待
C. 吧台
D. 合同

单头蜗杆主要用于 ；多头蜗杆用于 。