矿物类杂质的含量应小于A.1%B.2%C.3%D.4%E.5%

题库2022-08-02  23

问题 矿物类杂质的含量应小于A.1%
B.2%
C.3%
D.4%
E.5%

选项 A.1%
B.2%
C.3%
D.4%
E.5%

答案 B

解析
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