【单选题】【消耗次数：1】
混合沙浆的特性描述正确的是（）
①
有一定强度、耐久性，流动性、保水性较好
②
有一定强度、耐久性，流动性、保水性较差
③
强度低、耐久性差，流动性、保水性也较差
④
强度低、耐久性差，流动性、保水性较好
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