n.動(dòng)臂起重機(jī)；油井架吊桿；進(jìn)線架；飛機(jī)的起飛塔

The ginpole is the simplest form of derrick. 起重吊桿是一種最簡(jiǎn)單的起重機(jī)。

They were placed by a derrick mounted on rails on the bridge deck. 它們由軌道上的轉(zhuǎn)臂吊機(jī)吊放在橋面上。

We put up at the surface an oil derrick. 我們就在那塊地面上豎起一個(gè)井架。

The derrick has been skidded to the towing position. 井架已經(jīng)移到適合托航位置。

井架