... random sampling error 随机抽样误差 Value of sampling error 抽样误差值 measuring vertical sampling error 垂线抽样误差 ...
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But the practices showed that there were many obvious technical problems, such as the measured value too lower, the error increased with the depth of sampling and others.
但实践证明，仍存在着许多明显的技术缺陷，如测值偏低，误差随取样深度增大而增加等。
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