The influencing factors of coal arch camber in planomural coal bin and coal drop pipe with rectangular or circular cross section during coal drop are studied theoretically.
The ghoul in the attic howled and dropped pipes whenever he felt things were getting too quiet, and small explosions from Fred and George’s bedroom were considered perfectlynormal.
煤过程中平壁煤
面
状分
为矩
楼上的食尸鬼只要
得家里太安静了，就
叫，咣啷咣啷地敲管子。
