单项选择题
A.QL1200.51 B.DQLZ1200/1560.40 C.DBKH1900.30
A.QL700.51 B.DQLK1250/1500.30 C.DBK1500.43
A.铁矿石 B.溶剂矿 C. 煤炭
A.DQ1 B.SR2 C.DQ6
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