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
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A.estimated position
B.assumed position
C.fix
D.running fix
A.rapidly improving weather
B.deteriorating weather
C.a severe low pressure system
D.fair weather and calm
A.L
B.N
C.T
D.Z
A.a code hoist to indicate Greenwich mean time to follow
B.the letter G
C.the letters GT
D.the letter Z
A.darkening，growing in size and forming an anvil top
B.that shows extensive vertical development
C.creating cold downdrafts that are felt on the ground
D.All of the above
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