单项选择题
A.one all-round white light B.sidelights and a stern light C.only the outboard sidelight and a stern light D.a masthead light，sidelights，and a stern light
A single line of position combined with a dead-reckonin...
单项选择题A single line of position combined with a dead-reckoning position results in a(n)（）.
A.estimated position B.assumed position C.fix D.running fix
A single barometric pressure reading of 28.60 indicates...
单项选择题A single barometric pressure reading of 28.60 indicates（）.
A.rapidly improving weather B.deteriorating weather C.a severe low pressure system D.fair weather and calm
A signal indicating zone time is preceded with the lett...
单项选择题A signal indicating zone time is preceded with the letter（）.
A.L B.N C.T D.Z
