A semisubmersible rig under tow should be ballasted down if（）.<br>A:motion begins to be excessive<br>B:water begins to break over the pontoons<br>C:period of roll exceeds 12 seconds<br>D:forward progress is halted by head wind

A semisubmersible rig under tow should be ballasted down if（）.
A:motion begins to be excessive
B:water begins to break over the pontoons
C:period of roll exceeds 12 seconds
D:forward progress is halted by head wind

出自：海船船员证

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