在吊顶内、活动地板下等隐蔽场所内的气体灭火系统的灭火剂管道,可涂红色油漆色环,色环宽度不应小于()。
A.20mm
B.30mm
C.50mm
D.60mm
参考答案:C
Rather than ___ football with his friends, he decided to stay at home going over his lessons.
A.played
B.playing
C.play
D.to play
发现异常情况需要紧急停机时,可拉动沿线敷设的拉力电缆,或就近按下急停装置上的闭锁按钮,当()后要立即拔出闭锁按钮。
A.恢复正常
B.重新开启
C.问题未处理
D.恢复供电