A partially full tank causes a virtual rise in the height of the（）.

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• What is the principal danger from the liquid in a half full tank onboard a vessel?（）

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• If the cause of a sudden severe list is negative initial stability，counterflooding into empty tanks may（）.

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• If the cause of a sudden severe list or trim is negative initial stability，counter flooding into empty tanks may（）.

  A . increase the righting moment B . cause an increase in the righting arm C . bring the unit to an upright equilibrium position D . cause the unit to flop to a greater angle

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• If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will（）.

  A . increase the righting moment B . increase the righting arm C . increase list or trim D . decrease list or trim

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• Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.

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• The free surface effects of a partially-full tank in a floating ship increase with the （).

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