船用螺旋桨推进器

coach screw

screw conveyer for distributing matrices, spaces in composing machines

chasing tool【机】;screw tool【机】;threading tool chaser【机】

propulsion with ground-engaging cylindrical screw drives

kneading screw (kneading worm)

screw cap【包装】

draw-screw【机】;lifting screw【机】

bone screw set