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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The step of a pilot ladder which prevents the ladder from twisting is the（）.

A.proof bar
B.shifting bar
C.long bar
D.spreader