底卸式车一种货车，底下装有可卸货的门。
A freight car with a door in the floor through which materials are unloaded.
斜管(井)的结构分上层和下层，各为半圆或半椭圆，上层可装可卸。
The structure of the inclined tube (well) includes an upper layer and a lower layer which are both semicircles or semiellipses, wherein the upper layer can be assembled or disassembled.
应用推荐