陈旭麓说“自从有了民主政治的理想之后，官僚政治就一直成为人们憎恶的抨击的对象。这是理所当然的。但是，在历史地看，官僚政治的出现也有过它的必然性和合理性。”下列历史现象符合以上观点的是（  ）

如图所示，大气压强为p₀，气缸水平固定，开有小孔的薄隔板将其分为A、B两部分，光滑活塞可自由移动．初始时气缸内被封闭气体温度T，A、B两部分容积相同．加热气体，使A、B两部分体积之比为1：2．

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    The skin is ____ essential part of your body and its ____ organ. You have three ____ of skin which act as a barrier ____ disease, poisons and the sun's harmful rays. The ____ of your skin are also very ____: it keeps you warm or cool; it prevents your body from ____ too much water; it is where you feel cold, heat or pain it gives you your sense of ____. So you can imagine, if your skin gets ____ it can be very serious. First aid is a very important first step in the ____ of burns.