A.防滑系數(shù)<0.5 B.防滑系數(shù)<0.6 C.防滑系數(shù)<0.7 D.防滑系數(shù)<0.8
A.18-22℃;50-70% B.18-22℃;50-60% C.18-24℃;50-70% D.22-24℃;60-70%