fire area opening and closing
opening area of the Yangtze River to sea
Window Opening
窗户洞口
窗开度
井下套管磨开孔
井架未加遮挡部分
井架大门
窗口
window opening and lateral drilling
Window Opening and Sidetrack Drilling
Act Governing Relations between People of the Taiwan Area and Mainland Area
Adjacent area of mining area
boundary line of two times between earth excavation area and earth fill area
Breed in pastural area and fattening in agriculture area
Collection Area Merged with Reading Area
concentration area and depleted area
loess area in northwest area
logarithmic mean area log mean area