直(zhi)接(jie)測數法是(shi)憑(ping)借照布鏡(jing)或織物密(mi)度(du)(du)分(fen)(fen)析(xi)鏡(jing)來完成。織物密(mi)度(du)(du)分(fen)(fen)析(xi)鏡(jing)的刻度(du)(du)尺長度(du)(du)為5cm,在分(fen)(fen)析(xi)鏡(jing)頭下面,8安染(ran)色全棉帆布 輸送帶用(yong)纖維織物作帶芯(xin),用(yong)一般橡膠作覆蓋材料,表面光滑平(ping)整。棉纖維是(shi)應用(yong)最早(zao)的帶芯(xin)材料,易(yi)與橡膠粘(zhan)合,濕態(tai)時強度(du)(du)略有(you)提高,但破斷強度(du)(du)低〔大多在56牛/(毫米·層(ceng))左(zuo)右(you)〕,防(fang)腐防(fang)霉...