单项选择题
A.No fog signal
B.A prolonged blast at intervals never to exceed more than two minutes
C.A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes
D.A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
单项选择题 You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should（）.
单项选择题 You are aboard the give-way vessel in a crossing situation．What should you NOT do in obeying the Rules（）.
单项选择题 Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of one another（）.