短语词组短语HELICAL -WORM GEAR MOTOR 减速机helical -worm gear reducer 斜齿轮worm helical gear transmission 蜗杆斜齿轮传动worm helical gear wheel drive 蜗杆斜齿轮传动worm - helical gear 斜齿轮传动付worm and helical gear 蜗杆斜齿轮 返回 helical worm gear