消防二级网应有备用频率。备频应与常用频率有100HZ以上的频率间隔。() 发布时间:2017-07-28 03:32 │ 来源:www.tikuol.com 题型:判断题 问题: 消防二级网应有备用频率。备频应与常用频率有100HZ以上的频率间隔。()
题型:判断题 ___. I still took the “D” train, which saved me more than 50 yuan.[ ]A.Yes, I didn't B.No, I didC.Yes, I did D.No, I didn't 查看答案