单程运行时间12h以上列车的出退乘工时计算标准,外段出勤为()min。
A.90
B.80
C.70
D.60
参考答案:C
Mr Liu doesn't _____________ football. [ ]
A. liking
B. likes
C. like
D. liked
直放站最大增益误差不超过()dB。