double-helical tooth centring人字齿对中
double-circular tooth profile双圆弧齿廓
double circular-arc tooth gear双圆弧齿轮
double tooth-rollscrusher双齿辊碎煤机
double tooth-rolls crusher双齿辊碎煤机
staggered-tooth double-helical gear交错齿人字齿轮
continuous tooth double-helical gear连续齿人字齿轮