Objective To discuss the reason air - logged and the maintenance of water and gas conduit of gastrofiber ˉ scope.

目的探讨纤维胃镜水气管道堵塞的原因及维护方法.

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Strengthen oil gas conduit to build, preliminary form conduit to carry a network.

加强油气管道建设, 初步形成管道运输网.

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The airport and natural gas conduit.

机场和天然气管道.

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