单项选择题
A.毛煤 B.原煤 C.混煤 D.混块煤
A.15.2544修约为15.25 B.15.2560修约为15.25 C.15.2550修约为15.26 D.15.2650修约为15.26
A.粒煤 B.混煤 C.末煤 D.粉煤
A.Minh B.Mgnf C.MHC D.Mgf
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