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單項(xiàng)選擇題

A Doppler speed log indicates speed over ground（）.

A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current

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單項(xiàng)選擇題

A double male coupling is one that（）.

A.has left hand twist
B.has inside threads on both ends
C.has outside threads on both ends
D.takes two men to operate

單項(xiàng)選擇題

A fairly accurate estimation of a ship’s position can be calculated by a technique known as（）.

A.dead reckoning
B.pilotage
C.great circle sailing
D.geographic navigation

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