（2015•大连）如图所示，把装水的大烧杯放在水平升降台上，将一轻质玻璃杯倒扣在水中，玻璃杯内封闭一些气体，玻璃杯底用支架固定，支架在水中部分的体积忽略不计，水面都是静止的．将升降台缓慢升起一定高度（玻璃杯口没有接触大烧杯底部），水面静止后，下列说法正确的是（　　）

你能分辨几种笑法？（只能用一次）

①无拘无束疯狂地笑。____

②不愉快而勉强做出来的笑。____

③藏在心里不公开的笑。____

④狡猾阴险的笑。____

⑤开朗的笑。____

⑥无意义的一味的笑。____

⑦轻蔑讽刺或无可奈何的笑。____

⑧众人大声的笑。____

⑨故意做出的，不真实的笑。____

⑩捧着肚子的笑。____

一枚火箭搭载着卫星以速率v₀进入太空预定位置，由控制系统使箭体与卫星分离．已知前部分的卫星质量为m₁，后部分的箭体质量为m₂，分离后箭体以速率v₂沿火箭原方向飞行，若忽略空气阻力及分离前后系统质量的变化，则分离后卫星的速率v₁为（   ）

    A patent is an official document____(give)to an inventor by a government. This document ____(general) gives inventors the right to stop anyone else from copying, using or selling the invention without their permission.

    Inventions are the result of hard work. It may only take a moment of inspiration to think of a good idea but it takes a lot of research and experimentation to turn it into a(n)____ (use)and working invention. So, inventors deserve a reward for the amount of time they spend ____(develop)their ideas. They also need the ____(secure) of knowing that if they share the invention with ____rest of the world, nobody will steal it, use it or copy it without their permission.

    Patents also benefit the society ____return for patent protection. Inventors agree____(show)all the technical information about their invention. This information is available to everyone and has enough details ____can be used by people with basic knowledge to produce the invention. In this way, patents help to spread new knowledge, which can in turn help people find ____(solve)to different problems or to make further advances in science and technology.