短语词组短語piston type air compressor 活塞式空壓機Reciprocating piston minitype air compressor 微型往複活塞空氣壓縮機free piston air compressor 自由活塞空氣壓縮機air compressor piston ring 空氣壓縮機活塞環air compressor piston 空氣壓縮機活塞 返回 piston air compressor