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單項(xiàng)選擇題

（）is used for measuring horizontal and vertical angles.

A.The marine sextant
B.Thechronometer
C.The magnetic compass
D.The gyrocompass

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單項(xiàng)選擇題

（）means rudder to be held in the force and aft angles.

A.Steady
B.Meet her
C.Midships
D.Stop engines

單項(xiàng)選擇題

（）means check the swing of the vessel’s head in a turn.

A.Steady
B.Meet her
C.Midships
D.Stop engines

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