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10.用如图所示的实验装置来测量大气压强，将一定质量不溶于水的理想气体密封在烧瓶内，烧瓶通过细玻璃管与注射器和装有水银的U形管连接，最初竖直放置的U形管左右两边的水银面等高，烧瓶中气体体积为600L。现用注射器缓慢向烧瓶中注入150mL的水，稳定后水银面的高度差为25cm,不计细玻璃管和U形管中气体的体积，环境温度不变。则细玻璃管注射器烧瓶A.注水过程中烧瓶内气体体积不变B.注水过程中烧瓶内气体内能变小C.注水过程中烧瓶内气体放热D.大气压强为75cmHg【答案】CD【解析】由题意可知，水进入烧瓶中，烧瓶中气体体积变小，A错误；一定质量的理想气体，温度不变，内能也不变，B错误；气体体积减少，说明外界对气体做功，又气体内能不变，由热力学第一定律△U=W十Q知，气体向外界放热，C正确；开始时烧瓶内气压为大气压强，设为p1,初始V1=600mL,注水后V2=450mL,p2=p1十25cmHg,由玻意耳定律有p:V1=p2V2,解得p1=75cmHg,D正确。

弟一节满分5分How to Make a PosterFollow me to make a poster this way.Firstly,define the purpose of your poster.You must be clear about the audience and the message youwant to send.Secondly,organize a team of people with different talents and give every member some tasks toperform.Lastly,list the steps of making it by stating clearly what should be done at every stage and whatmaterial will be needed.For example,if you're making a poster to hang on the wall,you will write and drawon a poster board.I am looking forward to seeing your wonderful posters.