单项选择题
A ship that，at any time，operates seaward of the outermost boundary of the territorial sea is required to prepare，submit，and maintain a(n)（）.
A.synthetic plastic discharge plan B.oil discharge plan C.shipboard oil pollution emergency plan D.vapor recovery procedures plan
单项选择题 A safety shackle is identified by its（）.
单项选择题 A person who sees someone fall overboard should（）.
