活塞裙部型线
piston skirt profile
Molded line of piston skirt
piston skirt molded lines
中凸型活塞裙部
barrel-shaped piston skirt
活塞裙部
piston skirt
skirt of piston
Piston skirt cross-section
钢顶铝裙活塞
Steel Crown and Aluminum Skirt Piston
piston composed of steel crown and aluminum skirt
composite piston