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将配制的过饱和二水硫酸钙溶液置于密闭的蒸气压力锅中,在135~145℃,0.2~0.3MPa压力下处理,得到()
A . 生石膏
B . 熟石膏
C . 普通人造石
D . 超硬石膏
E . 普通人造石及超硬石膏
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