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單項選擇題

A Doppler log in the volume reverberation mode indicates（）.

A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water

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單項選擇題

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

單項選擇題

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

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