单项选择题
The use of this rule does not relieve vessels（）their obligations to comply with the local laws.
A.from B.of C.off D.over
单项选择题 The vessel ahead（）you is stopped.
单项选择题 The weather is often（）in a high-pressure area.
单项选择题 The winch at hatch No.3 is（）trouble.
