The influencing factors of coal arch camber in planomural coal bin and coaldrop pipe with rectangular or circular cross section during coaldrop are studied theoretically.
对落煤过程中平壁煤仓及截面形状分别为矩形、圆形的落煤管起拱的影响因素进行理论研究。
2
The precipitous drop in coal prices last year as the world economy swooned has delayed some projects.
而去年全球经济衰退造成的煤价暴跌延误了一些工程。
3
Local residents sometimes burn coal to keep warm when temperatures drop.