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照明线路每一单相回路宜采用双极胶壳开关或自动开关控制和保护,开关底边距地面高度一般为()米。
压力管道密封件采用型式试验的方式取得制造许可。
监控中心可以通过环境监视告警装置监视以下哪几种信号()。
晶状体源性青光眼包括()。
有关职业卫生标准的论述,不正确的是( )。
当用硅胶为基质的填料作固定相时,流动相的pH范围应为()。
旅客列车禁止编入装载危险货物的车辆。
下列关于胸壁结核的超声描述,不正确的是()。
特别重大或者重大突发公共事件发生后,各地区、各部门要立即报告,最迟不得超过小时,同时通报有关地区和部门()
《史记》记载从上古皇帝到汉武帝()的历史
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