基本解釋[經(jīng)濟學(xué)]提升滑輪英漢例句雙語例句The derrick man, positioned at the crown block, is to advise the driller when the snake is coming through the crown sheave.井架工看守在天車上，當(dāng)蛇皮接繩器到達天車時，通知司鉆。blog.sina.com.cnderrick block更多例句詞組短語短語derrick head block 吊桿頭滑車derrick heel block 吊桿底導(dǎo)向滑車;吊桿座滑車derrick k block 提升滑輪derrick head span block 吊桿頭跨繩滑車derrick head purchase block 上吊貨滑車derrick block更多詞組專業(yè)釋義經(jīng)濟學(xué)提升滑輪