單項(xiàng)選擇題

1 nautical mile is the lenth of an arc of a great circle which subtends an angel of（）at the center of the Earth.

A.1degree
B.1 minute
C.1second
D.1.5 degree

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單項(xiàng)選擇題

A ship is side to be（）when the whole ship moves bodily to port and then to starboard.

A.rolling
B.pitching
C.heaving
D.swaying

單項(xiàng)選擇題

A ship is side to be（）when the bow and stern rise and fall with the oncoming waves.

A.rolling
B.pitching
C.heaving
D.swaying