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建筑石膏呈洁白粉末状,密度约为( )

单选题
2021-09-02 11:38
A、5.6-5.75 g/㎝3
B、4.6-4.75 g/㎝3
C、3.6-3.75 g/㎝3
D、2.6-2.75 g/㎝3
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正确答案
D

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建筑石膏呈洁白粉末状,密度约为(     )

设a=5,b=4,c=3,d=2,则表达式3>2术b Or a=c And b<>c Or c>d的值是
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