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【单选题】
机床工作时,为防止丝杠传动和机动进给同时接通而损坏机床,在滑板箱中设有( ) 。
A.
安全离合器
B.
脱落蜗杆机构
C.
互锁机构
D.
开合螺母
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【单选题】What is the writer's purpose?
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to inform readers who don't have much money about ways they can travel .
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A.
To inform readers who don't have much money about ways they can travel.
B.
To tell readers about some of the best sightseeing tours in the world
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