直接測數法是憑借照布(bu)鏡或織(zhi)物密(mi)度(du)(du)(du)分析鏡來(lai)完成。織(zhi)物密(mi)度(du)(du)(du)分析鏡的刻度(du)(du)(du)尺長度(du)(du)(du)為5cm,在(zai)分析鏡頭下(xia)面,10858染色全(quan)棉(mian)帆布(bu) 輸送帶用纖維織(zhi)物作(zuo)帶芯,用一般橡膠作(zuo)覆蓋材(cai)料,表面光滑平整。棉(mian)纖維是應(ying)用最早的帶芯材(cai)料,易與(yu)橡膠粘合(he),濕(shi)態時強度(du)(du)(du)略有提高,但破(po)斷強度(du)(du)(du)低(di)〔大(da)多在(zai)56牛/(毫米·層)左右〕,防(fang)...