单项选择题
A.a lock that is open B.a sunken barge C.a dolphin，water intake and discharge D.the end of a wharf
As you approach mile 427.6 AHP，you see on the right sid...
单项选择题As you approach mile 427.6 AHP，you see on the right side a white buoy with orange bands and diamond. This buoy marks（）.
A.a cable crossing B.a sunken barge C.a submerged discharge pipe D.the end of a wharf
As you approach Giles Bend Cutoff Light (mile 367.7 LDB...
单项选择题As you approach Giles Bend Cutoff Light (mile 367.7 LDB)，what type of daymark would you see on the light structure?（）
A.Green diamond B.Green triangle C.Red diamond D.Red square
As the temperature of the air reaches the dew point，（）....
单项选择题As the temperature of the air reaches the dew point，（）.
A.rain must develop B.fog may form C.it begins to snow D.water freezes
