【单选题】
___0450.一个计算单元内配置的灭火器数量不得少于（ ）具。
A. 5
B. 4
C. 3
D. 2
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答案
D
解析
暂无解析
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【单选题】
___0455.纺织工业企业仓库电气防火管理规定，电源开关或者电闸箱必须设置在库房（ ），并有（ ）等措施。
A. 内；防尘
B. 内；防潮
C. 外；防雨、防潮
D. 外；防虫
【单选题】
___0480.图示为某企业车间的疏散门，采用推拉门，此门的隐患是（ ）。
A. 保温性差，车间受外部气温影响大
B. 开启费力，噪声大
C. 铁门，易发生锈蚀
D. 不利于紧急情况下开启逃生
【单选题】
___0483.某企业为方便气焊（割）作业，专门自制了承载氧气和乙炔气体的手推车（见图），哪里焊接就将车子推到哪里，你认为如此法的隐患是（ ）。
A. 气瓶不能直立
B. 车子没有制动，作业时会跑车
C. 氧气瓶与乙炔气瓶距离太近
D. 车子在运行时会有震动
【单选题】
___0490.下图为变配电室的警示标志，其正确的悬挂位置是（ ）。
A. 变配电室的门外
B. 变配电室内的醒目位置
C. 合闸即可送电的断路器或隔离开关的操作把手上
D. 正常供电的断路器或隔离开关的操作把手上
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