The main chemical composition of gypsum is（）
A.calcium sulfate
B.calcium aluminate
C.CaO
D.Al2O3
正确答案：calcium sulfate
The main chemical composition of gypsum is（）
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This may seem strange, but theoretically glass should be very strong because of the nature of its（）bonds.
In amorphous solids, it is believed that the atomic structure of a glass lacks any（）which is evidenced by X-ray diffraction anal
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