A vessel the passage of which is not to be impeded ____to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision. A. remains fully obliged B. has no obligation C. is not necessarily D. is exempted

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A vessel engaged in ____ shall not impede the passage of any other vessel navigating within a narrow channel or fairway.A. mine clearance operationB. towing operationC. dredging or surveying or underwater operationD. fishing

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单选题

The passage mainly discusses ___.

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单选题

The writer of the passage thinks that________.

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单选题

According to vessel‘s structure, the extreme fore end of the vessel is called _____.

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单选题

Which of the following roots refers to the blood vessel?

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