单项选择题
The cargo fall over the dock is called the（）.
A.burton fall B.down fall C.hatch fall D.stay fall
单项选择题 The Captain of the Port has closed to navigation，and buoyed，a section of a harbor. These buoys would be painted（）.
单项选择题 Red lights may appear on（）.
单项选择题 Preventer bars are fitted on lifeboat releasing hooks to prevent（）.
