【简答题】What were you up to when your parents came in?A. ____ for a while and ____ some reading. B. was playing; was going to do B. played; did C. had played; was going to do D. had played; did
【多选题】安装漏电保护器除遵守电气设备安装规程外,应注意()。
【判断题】与十进制数63相应的二进制数是 00111111
【多选题】安装漏电保护器除遵守电气设备安装规程外,应注意() 。
【判断题】墙背和填土之间存在的摩擦力将使主动土压力减小、被动土压力增大。