单项选择题
某矿的总回风量是3500m3/min，在总回测风站内测得瓦斯浓度是0.62%，无瓦斯抽放，该矿的绝对瓦斯涌出量是（）。
A.2.17m3/minB.21.7m3/minC.217m3/min
A、国家标准B、绿色食品标准C、企业标准D、地方标准
A.she was late for the parents’meetingB.the master talked about the problemC.she thought of the helping parentsD.her first day as leader ended terribly