短語(yǔ)詞組短語(yǔ)derrick head span block 吊桿頭跨繩滑車(chē)derrick head purchase block 上吊貨滑車(chē)derrick head cargo block 吊桿頭起貨滑車(chē);吊桿頭起重滑車(chē);上吊貨滑車(chē)derrick head shipment block 吊桿頭起貨滑車(chē)derrick k head cargo block 吊桿頭起貨滑車(chē) 返回 derrick head block