... 流向线 flow line; flowline 流向仪 flow direction vane; flow-direction meter 相流向 phase flow direction ...
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flow direction meter 怜方向仪
harmonic power flow direction meter 谐波流向仪
flow velocity and direction meter 流速流向仪
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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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