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. ;
控制点标志设置采用了深桩强制对中观测墩与普通标石相结合的方式；
The control point symbolized the establishment used the deep pile to force to the center to observe the way which the pillar and the ordinary monument unified;
控制点标志设置采用了深桩强制对中观测墩与普通标石相结合的方式；
The control point symbolized the establishment used the deep pile to force to the center to observe the way which the pillar and the ordinary monument unified;
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