To distinguish between ferrous and non-ferrous metals as well as cavities you can work in this mode.
为了区分黑色金属和有色金属以及空洞，您可以在此模式下工作。
By the action of groundwater erosion and chemolysis, cavities are well developed in limestone area, which causes many problems for pile foundation construction.
由于地下水潜蚀、化学溶蚀等作用，灰岩地区溶洞、土洞较为发育，给桩基施工带来较大困难。
According to the unstable status of solution mining in the last period, the remedy well, No. 146, has been drilled in the large area of connecting cavities for miming.
针对岩盐水溶开采后期生产不稳定的状况，在大面积连通采区溶腔内钻成了一眼补救井—146井。
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