多项选择题
A.SI指令:用于工作人员输入工号进入系统B.SI指令:使工号退出所占有的工作区C.CO:运算表达式D.PB:显示上一页
A.国内航空公司客票B.国航的客票C.厦航的客票D.东航的客票
A.Would you like a window seat or an aisle seat?B.Do you prefer a window seat or an aisle seat?C.There is no window seat or aisle seat available。D.Can I give you a window seat or an aisle seat?