单项选择题
A.Vessel heels until water enters a hatch
B.Vessel in collision floods through a damaged area above the waterline
C.Vessel takes on water due to the hatches being left open in heavy rain
D.Vessel takes on water by the propeller shaft due to failure of the stern gland
单项选择题 Which of the following marine insurance policies is normally purchased by the cargo owner?（）.
单项选择题 Which factor(s) might indicate that a towline should be removed from service? （）
单项选择题 Where the contract is to insure the subject-matter at and from，or from one place to another or others，the policy is called a（）.