Thetwinsaresoalikethatitsalmost___(possible)totellthemapart.
Peopletodayarehighlyconcernedaboutthequalityoftheairthey___(breath).
理想气体处于平衡态时压强为p，温度为T，玻尔兹曼常数为k，则该气体的分子数密度n=____________.
27.1mol氦气（视为单原子分子理想气体），在温度由17℃升高到27℃的过程中保持压强不变，求气体吸收的热量、对外界做的功
Mrs.Weinsteinbravelyandpersistentlyusedeveryskillandpowershehadtoherattackertosimplytakehercarandnotherlife.
