基本解釋[交通運輸工程]吊桿頭滑車詞組短語短語derrick head span block 吊桿頭跨繩滑車derrick head purchase block 上吊貨滑車derrick head cargo block 吊桿頭起貨滑車;吊桿頭起重滑車;上吊貨滑車derrick head shipment block 吊桿頭起貨滑車derrick k head cargo block 吊桿頭起貨滑車derrick head block更多詞組專業(yè)釋義交通運輸工程吊桿頭滑車