drain plug
排泄塞
排泄口塞
排放塞
排水塞
放电插头
排出塞
放油螺塞
放油塞
2-grade deceleration straight-tooth gear box
2K-H differential gear trains
2K-H type epicyclic gear trains
2-Stage Star Gear Train
Ⅱ compound gear rotator pump
4-axis CNC spiral bevel gear machine
a new type of oscillating tooth gear transmission
absorber of landing gear
AC metal closing switch gear