不能用现成的数学经验和方法解决的一种情景状态是( )。

单项选择题The temperature _____ a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure _____ it is subjected in the containing vessel.A.at which to whichB.from which at whichC.to which from whichD.in which on which

单项选择题领班查房的数量,不同的饭店有不同的规定,就中档饭店而言,在没有其他工作干扰的情况下,日班领班应负责()间房的工作区域,低档饭店负责80100间客房。