题型:选择题 We were swimming in the lake _____ suddenly the storm started.A.whenB.untilC.whileD.before 查看答案
题型:单项选择题 AB两站为对端站,若A站因某种原因突然停电;此时该B站S16板上应出现的告警为()A、RLOS、RLOF、ROOFB、TLOS、TLOCC、AULOP、HPLOMD、HP-TIM、HP-SLM 查看答案