活塞式
piston type air compressor
piston
reciprocation type
piston-style
piston-type
活塞式滑阀
piston-type sliding valve
piston valve
piston slide valve
活塞式大降深洗井技术
piston-like deep drop-down well-flushing technique
活塞式压缩机
piston compressor
Piston type compressor
Compressor of piston style
reciprocating (piston) compressor
reciprocating compressor
Reciprocal compressor
reciprocating refrigeration compressor