【单选题】【消耗次数：1】
84、（ ）时，新鲜风流由进风上山进人采区，清洗工作面后的污风经回风上山流入回风道，新风和污风均向上流动，沿倾斜方向的风路较短。而时，新鲜风流由进风下山进
①
下山开采
②
上山开采
③
上下山开采
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