单项选择题
What is meant by the term TOPPING THE BOOM?（）
A.Lowering the boom B.Raising the boom C.Spotting the boom over the deck D.Swinging the boom athwartships
单项选择题 What danger is presented if a waterspout passes over a ship?（）
单项选择题 What（）to him is whether the job of a deck officer allows him to pursue his studies.
单项选择题 To warp a vessel means to（）.
