单项选择题
A.Minimum speed estimate
B.Maximum speed estimate
C.Average speed estimate
D.A running fix should not be used under these conditions
单项选择题 You are making tow.A loaded，open-hopper barge with independent tanks has placards，with alternating red and white quadrants，located at each side and end.You inspect the barge and find slight traces of water in the wing voids due to condensation.What（）.
单项选择题 You are entering an east coast port and see a buoy with a yellow triangle painted on it.This indicates（）.
单项选择题 You are drifting in a locale where there is no current．As a rule，your vessel will lie（）.