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【判断题】
由两个螺旋副组成的,使活动的螺母与产生差动的螺旋传动称为差动螺旋传动A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】As space of our office is limited Is it possible to pile cartons here?
A.
No. Something more important is expected to be put here So, you’ve got to find somewhere to pile cartons.
B.
No. This place is not vacant. You mustn’t pile anything here
C.
No. This is an emergency exit. You mustn’t pile anything here
D.
Maybe you can. If you manage to persuade them to let you pile cartons, you can do that.
【单选题】职业病防治法确立了我国()的职业病防治工作基本方针和“分类管理、综合治理”的职业病防治管理原则。
A.
“预防为主、防治结合”
B.
“先预防、后治理”
C.
“边预防、边治理”
【单选题】What is an advantage of investing in bonds?______.
A.
Bonds are generally of lower risk than stocks.
B.
Bonds offer a good source of income for retirees.
C.
Bonds issued by any stable country are almost risk-free securities.
D.
All of the above.
【简答题】T here is no beam but will deform more or less under the action of forces .(双重否定)
【简答题】我国《职业病防治法》是()(日期)实施的，职业病的防治方针是()。
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