试题与答案

侵蚀性葡萄胎的特点是() A.小泡样组织局限宫腔 B.葡萄胎未排出不能诊为侵蚀性葡萄

题型:单项选择题 A1型题

题目:

侵蚀性葡萄胎的特点是()

A.小泡样组织局限宫腔

B.葡萄胎未排出不能诊为侵蚀性葡萄胎

C.可无葡萄胎史

D.不发生宫旁、肺及 * * 转移

E.葡萄胎组织侵入子宫肌层

答案:

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参考答案:D解析:本题考查平衡预算乘数的概念。平衡预算乘数是指政府收入和支出同时以相等数量增加或减少时,即政府在增加(或减少)税收的同时,等量增加(或减少)购买性支出,维持财政收支平衡,对国民收入变...

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A patent gives you the right to an invention. The patent protects its owner, which means the invention can’t be copied or sold without their agreement. In exchange, the owner must reveal information about the invention. This contributes knowledge that helps other inventors improve on their own research. A patent usually lasts about 20 years.

The first step to getting a patent is the application. The person applying must name the invention, explain its use and describe it clearly. The invention must be practical and contain some new characteristic — something that hasn’t been seen or used before. But not everything “new” can be patented. Many countries don’t allow patents on things like new concepts, scientific theories, medical procedures or substances already found in nature.

You may not be able to see patents, but they’re connected to nearly everything. There are patents on things you use every day, like plastic, medicine and your computer. There are patents on things that are unavailable on the market, too. Apple is well-known for its patents on potential products, such as the “iBike” or the “iKey”.

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Although many patented inventions can be failures, there’s plenty of room for success. So if you have a cool invention, try to patent it.

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