短語詞組短語pulley y block 滑輪組electric pulley -block 電動(dòng)葫蘆;電動(dòng)滑車組pulley -block luffing gear 陞降支臂用滑輪組tension pulley block 張緊滑車;張緊滑輪double iron pulley block 雙輪鉄滑車twin pulley block 雙滑輪組and wormwheel pulley block 蝸桿蝸輪滑車組Pulley Block Hook 滑輪群拉鉤 返回 pulley block