【判断题】
需要三相五线制配电的电缆线路可以采用四芯电缆外加一根绝缘导线替代。
A. 对
B. 错
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答案
B
解析
暂无解析
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用电设备的开关箱中设置了漏电保护器以后,其外露可导电部分可不需连接PE线。
A. 对
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施工现场停、送电的操作顺序是:送电时,总配电箱→分配电箱→开关箱;停电时,开关箱→分配电箱→总配电箱。
A. 对
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一般场所开关箱中漏电保护器的额定漏电动作电流应不大于30mA,额定漏电动作时间不应大于0.1s。
A. 对
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每台用电设备必须有各自专用的开关箱。
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同一个开关箱可以直接控制两个插座。
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工作零线的颜色标记为淡蓝色。
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保护零线的颜色标记为淡蓝色。
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手持电动工具中的塑料外壳Ⅱ类工具可不接保护零线。
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夯土机械保护零线连接点应有一处。
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使用塑料外壳的Ⅱ类手持电动工具可不必穿戴个人防护用品。
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乙炔瓶在储存或使用时可以水平放置。
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氧气瓶体为白色,字体为红色;乙炔瓶瓶体为浅蓝色,字体为红色。
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焊件进行临时点固时可由配合焊工作业的人员进行。
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B. 错
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氧气瓶应设有防震圈和安全帽
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施工现场架设或使用的临时用电线路,当发生故障或过载时,就有可能造成电气失火。
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物质的燃点越高,发生的危险性越大。
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施工现场应当设置消防通道、消防水源、配备消防设施和灭火器材,现场入口处要设置明显标志。
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雨天不宜进行现场的露天焊接作业。
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使用中的气瓶可以放在烈日下曝晒,可以离火源及高温区较近,但距明火不应小于10m。
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每个气瓶上套两个防震圈,当气瓶受到撞击时,能吸收能量,减轻震动并有保护瓶体标志和漆色不被磨损的作用。
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贮存易燃物品的仓库大门应当向内开。
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电焊机的外壳必须有可靠的接零或接地保护。
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使用滑轮的直径与钢丝绳直径的比值应不小于50。
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拆除工程施工区应设置硬质围挡,非施工人员不得进入施工区。
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施工现场消防车道出入口不宜少于2个。
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易燃易爆危险品库房与在建工程的防火间距不应小于15m。
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宿舍、办公用房的建筑构件的燃烧性能等级应为A级。
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室外使用的电焊机应设有防水、防晒、防砸的机棚,不必备有消防用品。
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可以在乙炔瓶上放置物件、工具或缠绕悬挂橡皮管及焊割炬等
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