将土样送试验室做击实试验，确定其最优含水率和现场控制干密度。
Send soil samples to lab for compaction test so as to determine the most reasonable water content ratio to enable on-site control of dry density.
研究一种确定旧管道阴极保护电流密度的新方法。现场试验结果表明，运用该方法确定旧管道阴极保护电流密度是准确实用的。
A new method is introduced to determine the current density required for protecting an aged underground pipeline. The field test results show that this method is exact and practical.
研究一种确定旧管道阴极保护电流密度的新方法。现场试验结果表明，运用该方法确定旧管道阴极保护电流密度是准确实用的。
A new method is introduced to determine the current density required for protecting an aged underground pipeline. The field test results show that this method is exact and practical.
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