室内某一点的压力和室外同标高未受扰动的空气压力的差值称为该点的（）。
参考答案：余压
王师傅和李师傅各自要做360个零件，王师傅每小时做18个，李师傅每小时做24个，李师傅比王师傅快几小时？
— These clothes are very nice. Could I ______?
— Sure. [ ]
A. try it on
B. try them on
C. try on it
D. try on them
