Each gas line shall be clearly labeled (colour and written code) for every 1.5-meter distance. Labeling shall also indicate the direction of gas flow.
气体管路每隔1.5米的距离，都要有明确标示，同时指示气体的流向。
Each gas line shall be clearly labeled (colour and written code) for every 1.5-meter distance. Labeling shall also indicate the direction of gas flow.
气体管路每隔1.5米的距离，都要有明确标示，同时指示气体的流向。
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