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單項選擇題

（） system is arranged to ensure that water can be drawn from any tank or the sea and discharged to any other tank or the sea as required to trim the vessel.

A.The domestic water
B.Bilge water
C.Oil transfer
D.The ballast

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單項選擇題

（） connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis.

A.A cut-off lever
B.A swivel block
C.A cross-head
D.A driving gear

單項選擇題

Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.

A.the piston rod
B.the tiller arm
C.the connecting rod
D.the rudder

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