單項(xiàng)選擇題A Doppler log in the bottom return mode indicates the（）.

A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground


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1.單項(xiàng)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

2.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

3.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

4.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

5.單項(xiàng)選擇題A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind（）.

A.blows the fire back toward the vessel
B.comes over the bow
C.comes over the stern
D.comes over either beam