皮皮学，免费搜题
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【单选题】
气液分离器的主要作用是 （ ）A.
分离冷凝气体
B.
分离液态制冷剂
C.
分离水分
D.
分离冷冻机油
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the whole world by publishing it, keep the idea secret, or patent it. A granted p...
A.
It is necessary for an inventor to apply for a patent before he makes his invention public.
B.
A patent holder must publicize the details of his invention when its legal period is over.
C.
one can get all the details of a patented invention from a library attached to the patent.
D.
When a patent becomes out of effect, it can be re-patented or extended if necessary.
【简答题】A．Courses for doctors. B．Courses for businessmen. C．Courses for reporters. D．Courses for lawyers.
【单选题】When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world by publishing it, keep the idea secret, or patent it. A granted patent ...
A.
an approach to patents
B.
the application for patents
C.
the use of patents
D.
the access to patents
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