题目

如图所示，密封圆筒形容器内盛有温度为27℃压强为1个标准大气压的空气，容器中间用两个绝热的而且能自由滑动的活塞将容器分成A、B、C三个相等的部分，每部分体积均等于，当将A部分加热到227℃，C部分加热到327℃时，B部分温度保持不变，B部分的体积是_________V。 答案：简解：设A部分加热过程体积膨胀设为，C部分加热过程体积膨胀设为，两部分气体膨胀稳定后压强设为P，B部分气体等温压缩稳定之后的压强也为P，体积为，根据气体实验定律，对A、B、C三部分气体有：得：消去P，代入数据得：整理后得：解得：，压缩后B的体积为：根据句子意思，从方框中选用恰当的词或短语填空。such as, the opposite of, at a time, felt lonely, except,has left, has been away from, a couple of, was tired out【1】Australian seasons are ____________________________ours.【2】Tom ______________ after the whole day’s hard work.【3】We celebrate many festivals,_________ Spring Festival, Mid-autumn Festival and so on .【4】Everyone in our class went to the zoo___________ Eric.【5】I saw _______________young men get out.【6】He is very fat and he can eat three bowls of noodles__________.【7】My uncle _____________his hometown for about 30 years.【8】The old man ______________after his wife died.