单项选择题
It is customary in shipping practice to quote freight rates（）weight or measurement,ship’s option.
A.on the basis of B.as a result of C.arise from D.come into being
单项选择题 When underway in a channel,you should keep to the（）.
单项选择题 （）is not ordinarily applied to passenger or to combination passenger and freight ships.
单项选择题 A vessel shall be deemed to be overtaking when she can see at night（）.
