单项选择题
A.7 B.20 C.15 D.23
A.3-30t/h B.3-9t/h C.3-29t/h D.3-15t/h
A.5-50t/h B.5-65t/h C.10-20t/h D.10-55t/h
A.1-10t/h B.5-10t/h C.1-15t/h D.10-35t/h
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