单项选择题
A report of casualty to a mobile offshore drilling unit must include （）.
A.the estimated cost of damage to the unit B.an evaluation of who was at fault C.the amount of ballast on board D.the name of the owner or agent of the unit
单项选择题 A report of casualty to a mobile offshore drilling unit must be made in writing to which office? （）
单项选择题 A red triangular daymark marks （）.
单项选择题 A rapid rise or fall of the barometer indicates（）.
