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單項(xiàng)選擇題

A device used to enlarge the size of an existing bore hole, having teeth arranged on its outside circumference to cut the formation as it rotates is a (n)（）.

A.enlarge bit
B.casing bit
C.hole opener
D.casing opener

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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

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

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