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The clinker product of Portland cement need to add gypsum to（）the（）process.
The clinker product of Portland cement need to add gypsum to（）the（）process.
正确答案：retard setting
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材料概论
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Unlike crystals, glasses do not have well defined melting points, but exhibit a（）Tg.
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Concrete is basically a mixture of two components:（）and a（）.