火灾自动报警系统导线敷设后,应对每回路的导线用500V的绝缘电阻表测量绝缘电阻,其对 发布时间:2017-04-26 12:37 │ 来源:www.tikuol.com 题型:单项选择题 问题: 火灾自动报警系统导线敷设后,应对每回路的导线用500V的绝缘电阻表测量绝缘电阻,其对地绝缘电阻值应不小于( )MΩ。A.10 B.15 C.20 D.30
题型:单项选择题 Because of the poor harvest, wheat prices have _____ in the last six months.A.addedB.jumpedC.amountedD.developed 查看答案