题目:
国标规定,以理论分选密度(δ)扣除沉矸(或低密度物)作为100%计算,δ±0.1含量为()%时,该原煤的可选性为中等可选。
A、≤10.0
B、20.1~30.0
C、10.1~20.0
D、30.1~40.0
答案:
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