职称英语卫生类C级模拟习题及答案

XX年职称英语卫生类C级模拟习题及答案 　　新一轮备考即将开始，网为帮助考生高效备考职称英语，下面是网提供应大家关于职称英语卫生类C级模拟习题及答案，希望对大家的备考有所帮助。 　　1 Scienti

XX年职称英语卫生类C级模拟习题及答案 新一轮备考即将开始，网为帮助考生高效备考职称英语，下面 是网提供应大家关于职称英语卫生类C级模拟习题及答案，希望对 大家的备考有所帮助。 1Scientists recently made public the tiniest electric motor ever1 built. You could stuff hundreds of them into the period at the end of this sentence. One day asimilar engine might power atiny mechanical doctor that would travel through your body to remove your disease. 2The motor works by shuffling atoms between two molten metal droplets in acarbon nanotube. One droplet is even smaller than the other. When asmall electric current is applied to the droplets, atoms slowly get out of the larger droplet and join the smaller one. The small droplet grows —but never gets as big as the other droplet —and eventually bumps into the large droplet. As they touch, the large droplet rapidly sops up the atoms it had previously lost. This quick shift in energy produces apower stroke2. 3The technique exploits the fact that surface tension —the tendency of atoms or molecules to resist separating —bees more important at small scales3. Surface tension is the same thing that allows some insects to walk on water. 4Although the amount of energy produced is small —20 microwatt s— it is quite impressive in relation to the tiny scale of the motor4. The whole setup5 is less than 200