open shop
开放的程序站
开放厂
开放工厂
开放式计算站
开启所选的项目
开场
自由作业
Floor Level
地面高度
楼面标高
底板标高
楼面水平
底板高度
地台水平
最低水平
楼面
register transfer level floor plan
floor quarryquarry tile floor tile
coupling mechanism between upper level and low level jet
fiscal system at county level and township level
interaction between upper level and lower level
municipal level and county level
ability grouping; grouping by ability; segregation by ability