单项选择题
Which of the following operations aboard a tanker must be recorded in the Oil Record Book（）.
A.Any internal transfer of oil cargo during a voyage B.The discharge overboard in port or at sea of any bilge water accumulated in machinery spaces C.The loading or unloading of any or all oil cargo D.All of the above
单项选择题 For an upright vessel, draft is the vertical distance between the keel and the （）.
单项选择题 Which of the following machinery space operations is required to be logged in the Oil Record Book?（）
单项选择题 The distance between the bottom of the hull and the waterline is called （）.
