交换生离校时应把饭卡交回外事处留学生办公室。
The exchange students should give the meal card back to the Foreign Affairs Office.
我们办公室每年圣诞节都有礼物交换（的活动）。
有一个控制室与交换机和控制器。
介绍双室沸腾床交换器的特点和工作过程、水处理流程及应用。
The character and working procedure of double chamber fluidized bed is introduced.
介绍双室沸腾床交换器的特点和工作过程、水处理流程及应用。
The character and working procedure of double chamber fluidized bed is introduced.
应用推荐