单项选择题 Nothing in these Rules shall（）any vessel，or the owner，master or crew thereof，from the consequences of any precaution which may be required by the ordinary practice of seaman，or by the special circumstances of the case.

单项选择题 Lifeboats are numbered（）.Odd numbers to starboard and even numbers to port.

单项选择题 Jettisoning weight from topside（）.