单项选择题
A.pumped overboard to calm the seas
B.drained to the lower hull to reduce free surfaces
C.filled to ensure that sufficient fuel oil is available during a lengthy emergency
D.partially drained to increase free surfaces in order to reduce motions
单项选择题 When a vessel is swinging from side to side off course due to quartering seas，the vessel is （）.
单项选择题 When a deck cargo is secured with chain or wire lashings and grab (pear) links，which statement is FALSE?（）
单项选择题 What indicates that a tropical cyclone may be within 500 to 1，000 miles of your position?（）