单项选择题
The speed at which a storm centre moves is the（）.
A.speed of movement
B.speed of advance
C.speed of storm
D.storm movement speed
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单项选择题
The speed of a vessel adjusted to that of a pilot boat at which the pilot can safely embark is（）.
A.ground speed
B.boarding speed
C.relative speed
D.speed of the vessel -
单项选择题
The step of a pilot ladder which prevents the ladder from twisting is the（）.
A.proof bar
B.shifting bar
C.long bar
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单项选择题
The term of landfall means（）.
A.land first sighted when vessel approaching from seaward
B.land last sighted when vessel leaving from a port
C.in sight of one another when vessel underway
D.in sight of an island during a ship on her voyage
