词汇	roof timbering
释义	roof timbering 顶板支护,顶板支架
随便看	water and soil erosion? water and soil erosion monitoring water and soil image community Water and soil lose water and soil loss water and soil losses water and soil loss quantity water and soil loss sensitivity water and soil maintenance water and soil pollution water and soil preservation water and soil preserve water and soil pressure burst water and soil reservation information system water and soil resources water and soil runoff water and soil separation water and solids Water and solute migration water and steam water and steam chemistry process water and steam distillation water and steam parameters water and steam quality water and steam quality monitoring instrument