單項(xiàng)選擇題

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

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