单项选择题
A vessel sailing from Liverpool to New York puts into Boston，Mass. for emergency repairs. If no inward foreign cargo is to be discharged at that port，which of the following documents is required?（）
A.Custom Manifest B.Inward Foreign Manifest C.Pro Forma Manifest D.Traveling Manifest
单项选择题 A vessel may enter a traffic separation zone（）.
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)（）.
单项选择题 A safety shackle is identified by its（）.
