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第1期砂的平均粒诬与捆度模教之比蛟研究···········································,·········一斋炳剥地墓土壤中应力和变形的圈解法··································4····
The average grain framing of the first stage of sand and the ratio of the bundle to the standard model Kao Jiao Research · ········································································································ ··········································· 4