To gather millimetre

To gather millimetre-accurate results the instrument then has to record for several hours. In the thin air of Everest's "death zone", operating these instruments can be hazardous for surveyors. Members of a Nepalese expedition to take GNSS measurements on Everest in 2019

อ่านต่อเพิ่มเติม โรงเรียนวัดสวนขัน

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