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proportionate sampling
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proportionate sampling
按比例抽样
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ordovician
Ordovician
Ordovician Period
ordovician system
Ordovician System
ordre
ordure
ordure energy
ORD(optical rotary dispersion)
ore
ore
ore
ore
ore
ore
ore and bulk carrier
ore anomaly
ore bearing vein
ore benefication
ore blending
orebody
ore breaking plant
ore briquette
ore-bulk carrier
ore-bulk-container carrier
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