單項選擇題The center of volume of the immersed portion of the hull is called the（）.
A.center of buoyancy
B.center of floatation
C.center of gravity
D.tipping center
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A.water-tight
B.air-tight
C.fire-tight
D.oil-tight
2.單項選擇題The deck control valve to be（）after being repaired.
A.moved and fitting again
B.removed and refitted
C.reproduced and put on again
D.return and attached again
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