单项选择题
If your vessel has a GM of one foot and a breadth of 50 feet，what will be your full rolling period? （）
A.11 seconds B.15 seconds C.20 seconds D.22 seconds
单项选择题 If a vessel is engaged in fishing according to the definitions in the Rules，it will have （）.
单项选择题 How are riveted lap joints made watertight?（）
单项选择题 For the purpose of the Rules，except where otherwise required，the term（）.
