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gradation curve
el. 粒度级配曲线
expl. 粒级曲线
hydroel.st. 级配曲线; 颗分曲线; 颗粒分析曲线
tech. 大小颗粒分布曲线
gradation curve: 6 phrases in 3 subjects
Desert science1
Hydroelectric power stations2
Technology3