局部放电试验使用脉冲电流法时,可以有直接法和平衡法。()...
Friday, September 16, 2022
Saturday, September 17, 2022
长时间工作或停留的房间或场所,选用照明光源的显色指数不宜小于()...
Friday, September 16, 2022
除住宅、商住楼的住宅部分、游泳池、溜冰场外,建筑高度不超过100...
Saturday, September 17, 2022
Saturday, June 3, 2023
如要将一个最大幅度为5.1V的模拟信号转换为数字信号,要求输入每...
Friday, September 16, 2022
Friday, September 16, 2022
Saturday, September 17, 2022
具有2区或22区爆炸危险环境的建筑物按防雷要求属于()类。...
Saturday, September 17, 2022
在TN及TT系统接地形式的低压电网中,当选用Yyn0联结盟的三相...
Saturday, September 17, 2022
Friday, September 16, 2022
Saturday, September 17, 2022
绝缘配电线路与甲类火灾危险性的生产厂房、甲类物品库房、易燃、易爆...
Friday, September 16, 2022
Friday, September 16, 2022
某水泵扬程为8.5m,流量为260L/s,水泵效率为0.82,传...
Saturday, September 17, 2022
凝结水泵很容易产生汽蚀和吸入空气,是因为该泵的吸入侧处于()状态...
Saturday, September 17, 2022
根据《低压配电设计规范》,直敷布线可用于正常环境的屋内场所,并应...
Friday, September 16, 2022
Friday, September 16, 2022
一声波波源相对媒质不动,发出的声波频率是V0。设以观察者的运动速...
Friday, September 16, 2022
动火作业,是指能直接或间接产生明火的作业,包括熔化焊接、()、喷...
Saturday, September 17, 2022