Geologist so every so often The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.

 
  • 地質(zhì)學(xué)家需要知道鉆頭已經(jīng)到達什么樣的巖層,因此時(shí)常要用取芯鉆頭取樣。
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