Liquefied petroleum gas(LPG)pipelines were embedded deeply underground. It was difficult to test, take sample and monitor operation conditions.
液化气管道深埋在地下，存在检测和取样困难，对其运行状况难以掌握。
Liquefied petroleum gas(LPG)pipelines were embedded deeply underground. It was difficult to test, take sample and monitor operation conditions.
液化气管道深埋在地下，存在检测和取样困难，对其运行状况难以掌握。
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