单项选择题
A.This reading is at the same elevation as the 6.2 ft. mark on the gage at Head of Passes
B.A vessel drawing 8 ft would be able to pass over the sill at Old River Lock
C.This reading is 6.4 feet below the Low Water Reference Plane
D.A vessel drawing 7 ft. would be able to pass through the locks at Lower Old River
单项选择题 As you approach Kate Aubrey Bar Light (mile 788 AHP)，yoursearchlight will show what type of marking at the light? （）
单项选择题 An overtaking situation would be one in which one vessel is approaching another from more than how many degrees abaft the beam? （）
单项选择题 An ocean tow is sinking in deep water. Attempts to sever the towing hawser are unsuccessful. Which action should now be taken? （）