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單項(xiàng)選擇題

Pitching is angular motion of the vessel about what axis?（）.

A.Longitudinal
B.Transverse
C.Vertical
D.Centerline

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Radio beacon service of John Light（）discontinued.

A.has been
B.have been
C.have
D.has

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Ships’ masters are requested to ensure that during their call at this port , all discharging outlets are（）.

A.blockaded
B.opened
C.closed
D.enclosed

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