单项选择题
Before any loading takes place any signs of the previous cargo should do（）.
A.kept B.removed C.replaced D.recycled
单项选择题 Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）
单项选择题 Which of the following shall not the officers in charge of the navigational watch do?（）
单项选择题 The helm command PORT TWENTY means（）.
