标志桩、测试桩、里程桩、警示牌等燃气管道设施安全识别标志；
The safety identification marks for fuel gas pipeline facilities, such as mark stake, test stake, mile stake, warning board, etc. ;
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这位网友写道，这是一桩里程碑式的交易。
'This is a corner stone deal,' Heritage wrote.
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