... 外海钻油设备 off shore drilling rig; off shore oil drilling rig 外航道 exterior channel; outer route 外航路 offshore tracks ...
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Macao outer harbor route 澳门外港航道
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The device is mainly made up of inner tube, outer tube, piston tube, end cover, retaining ring, hanger, liquid-route element and sealing element.
该装置主体由内管、外管、活塞管、端盖、承压环、吊耳、液路元件和密封元件等组成。
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