取样垂线
Sampling vertical
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本文根据长江、黄河近年来的试验资料，对悬沙垂线取样方法作了初步分析。
On the basis of experimental data gathered on the Chang Jiang and Yellow River, preliminary analysis has been made for sampling of suspended material along verticals.
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