单项选择题
A pilot vessel on pilotage duty at night will show sidelights and a stern light （）.
A.when at anchor B.only when making way C.at any time when underway D.only when the identifying lights are not being shown
单项选择题 A pilot vessel may continue to sound an identity signal if she is （）.
单项选择题 A pilot chart does NOT contain information about （）.
单项选择题 A petroleum liquid has a flash point of 85°F. This is a grade （）.
