fresh water sand
... fresh water pump 淡水泵 fresh water sand 淡水砂 fresh water shell button 淡水贝壳钮扣 ...
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水泥胶砂和混凝土的抗压、抗折强度与淡水拌和的相当。
Cement morter and concrete prepared with seawarer and those prepared with fresh water are comparable in bending strength and compression strength.
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