单项选择题
All ships（）suspected infectious disease on board should radio information to Port Health Officer.
A.with B.has C.have D.had
单项选择题 After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means（）.
单项选择题 A safe fuel system must（）.
单项选择题 A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）
