单选题:当闭路电视电缆与其它线路共沟(隧道)敷设时,与220V交流供电线的最小间距是( )mm。 题目分类:岗位实务知识 题目类型:单选题 号外号外:注册会员即送体验阅读点! 题目内容: 当闭路电视电缆与其它线路共沟(隧道)敷设时,与220V交流供电线的最小间距是( )mm。 A.100 B.200 C.300 D.500 参考答案:【答案仅供学习,请勿对照自行用药等】 答案解析:
有线电视系统应采用单相220V、50Hz交流电源供电.电源配电箱内,宜根据需要安装( ) 有线电视系统应采用单相220V、50Hz交流电源供电.电源配电箱内,宜根据需要安装( )A.漏电保护器 B.避雷器 C.浪涌保护器 D.过电压继电器 分类:岗位实务知识 题型:单选题 查看答案
As the journey was a long one,he took a friend with him for As the journey was a long one,he took a friend with him for_______.A.pleasure B 分类:岗位实务知识 题型:单选题 查看答案
_______determines a good meal varies from country to countr _______determines a good meal varies from country to country.A.What B.That C.It 分类:岗位实务知识 题型:单选题 查看答案
There aren’t many pandas_______in the world today. There aren’t many pandas_______in the world today.A.alive B.living C.lively D.l 分类:岗位实务知识 题型:单选题 查看答案