题目内容

在混凝土中,胶凝材料浆是通过骨料颗粒表面来实现有效粘结的,骨料的总表面积越大,胶凝材料越节约。()

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磨细的活性混合材料,它们与水调和后,将立即硬化。()

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According to the author, our goal should be______.

satisfying needs and wants by creating and exchanging goods and value with others.

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