题目内容
石膏的特征性状是
2021-10-23
A.呈长块状/板块状或不规则形
B.用指甲不能刻划
C.易纵向断裂，纵断面具纤维状纹理，显绢丝样光泽
D.体重，质硬
E.煅石膏为白色粉末或酥松的块状物
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