火灾发生下山独头煤巷中段不得直接灭火，火灾发生上山独头煤巷中段可以直接灭火。
参考答案：错
John likes walking in the open air, ______. [ ]
A．so does Tom
B．also does Tom
C．Tom likes also
D．so Tom does
铸型烘烤与焙烧最好的方法是
A．电烤箱B．炭气炉C．以上都不是D．煤气炉E．自控烤箱
