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由中性点不接地系统供电的爆炸危险场所,必须装设发出信号的()装置。
某项目在人工挖孔桩施工发生了触电伤亡事故,据事故调查,该项目安全管理不到位,施工组织设计中没有现场临时用电方案,也没有人工挖孔桩的专项施工方案。出事地点配电箱没有配备漏电保护开关,现场用电采用的是三相四线制。“两级保护"主要指采用漏电保护措施,除在末级开关箱内加装漏电保护器外,还要在上一级分配电箱或总配电箱中再加装一级漏电保护器,总体上形成两级保护。
“公子益师卒”,《公羊》称“远也”,意指空间距离很远
非信贷资产风险分类中风险分类法是根据资产账龄、交易对手履行合同和债务偿还能力等进行质量分类的方法,主要适用于()。
胚胎学中有两个互相对立的学说,它们是()
导致龋齿的最主要食物因素是()
施工现场的固定露天电箱、分电箱必须架空设置,其底边距地高度不小于()。
RA Response消息中的内容不包括()
()是指单位食品或每食用份食品中提供的营养成分种类和含量。
中国文化的方向、颜色崇尚是怎么来的?
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