(来学网)综合考虑行车排水和通风,地下公路隧道的坡度i应是()。
  • A.
    (来学网)0.1%≤i≤1%
  • B.
    (来学网)0.3%≤i≤3%
  • C.
    (来学网)0.4%≤i≤4%
  • D.
    (来学网)0.5%≤i≤5%