It's a mean of geotechnical investigation, including borehole surveying, costeaning, trenching exploration, test pitting, hole exploration, geophysical exploration and penetration sounding.
岩
勘察的一种手段，包括钻探、井探、槽探、坑探、洞探
及物探、触探等。
It's a mean of geotechnical investigation, including borehole surveying, costeaning, trenching exploration, test pitting, hole exploration, geophysical exploration and penetration sounding.
岩勘察的一种手段，包括钻探、井探、槽探、坑探、洞探及物探、触探等。
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