单项选择题
A.You should alter course to the right to increase the rate of the bearing change
B.You are making more speed over the ground than you estimated
C.You should alter course to decrease the distance that you will pass off Middle Ground Shoal
D.You can hold the present course and safely pass buoy "18"
单项选择题 As you approach Old River Control Structure Light you see a flashing amber light. You should（）.
单项选择题 As you approach mile 659.4 AHP，you see on the right descending bank a flashing green light. This light marks（）.
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（）.