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.
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。
3
To arch the neck and stimulate the cervical spine, lengthen the neck, drop the head back, lift the chin, and open the throat;