The bedrock bench marks have made a significant improvement and play role in both of height controlling and plane location controlling.
该基岩标较以往监测标志有重大改进，并兼有高程控制与平面位置控制的作用。
The bedrock bench marks have made a significant improvement and play role in both of height controlling and plane location controlling.
该基岩标较以往监测标志有重大改进，并兼有高程控制与平面位置控制的作用。
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