A semisubmersible rig under tow should be ballasted down if（）.
- Amotion begins to be excessive
- Bwater begins to break over the pontoons
- Cperiod of roll exceeds 12 seconds
- Dforward progress is halted by head wind
问题
A semisubmersible rig under tow should
参考解析：
分类：常规海事声明与延伸海事声明题库
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