对于整个锅炉机组而言最佳煤粉细度是指()。
A.磨煤电耗最小时的细度
B.制粉系统出力最大时的细度
C.锅炉净效率最高时的煤粉细度
D.总制粉单耗最小时的煤粉细度
参考答案:C
井下发生瓦斯、煤尘爆炸后,现场人员必须迅速戴好自救器并沿()路线撤离危险区。
A.回风
B.避灾
C.进风
Where shall the key to C02 room be kept?()
A.In master's cabin
B.In third office's cabin
C.In a break-glass-type enclosure conspicuously located adjacent to the room
D.In a locked locker conspicuously located adjacent to the room