Tight line device is a lifting gear.

紧线器是一种起重工具.

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The tight line transportation technology of oil pipeline must rely on reliable safety and protection means.

输油管道密闭运行,必须有可靠的安全保护.

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In actual depressant crude pipeline transportation, a crude sample is transported in tight line with pressure.

在加剂输送管道中, 油样为密闭带压输送.

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