直接測(ce)數法是憑借照布(bu)鏡或織(zhi)物(wu)密度(du)(du)分(fen)析鏡來完(wan)成。織(zhi)物(wu)密度(du)(du)分(fen)析鏡的刻度(du)(du)尺長(chang)度(du)(du)為(wei)5cm,在分(fen)析鏡頭下面(mian),一(yi)塊長(chang)條形玻璃片上刻有一(yi)條紅線, 棉(mian)(mian)帆(fan)布(bu) 就是棉(mian)(mian)線布(bu) 俗稱CC56,還有聚(ju)酯輸(shu)(shu)(shu)送(song)帶(dai)(dai)(dai)、尼龍(long)輸(shu)(shu)(shu)送(song)帶(dai)(dai)(dai)、相(xiang)比棉(mian)(mian)帆(fan)布(bu)輸(shu)(shu)(shu)送(song)帶(dai)(dai)(dai)拉(la)(la)力大。棉(mian)(mian)帆(fan)布(bu)輸(shu)(shu)(shu)送(song)帶(dai)(dai)(dai),適(shi)用(yong)于短距離、載量中等條件下輸(shu)(shu)(shu)送(song)物(wu)料,拉(la)(la)力比較低(di),承重有一(yi)定(ding)的...