单项选择题
A vessel（）when underway shall so far as possible，keep out of the way of a vessel not under command.
A.having engaged in fishing B.engaging in fishing C.engaged in fish D.engaged in fishing
单项选择题 A vessel（）a crossing vessel，shall not normally enter a separation zone or cross a separation line.
单项选择题 A proper look-out shall be maintained（）.
单项选择题 A proper look-out must be kept（）.
