单项选择题
A.having engaged in fishing B.engaging in fishing C.engaged in fish D.engaged in fishing
A vessel（）a crossing vessel，shall not normally enter a ...
单项选择题A vessel（）a crossing vessel，shall not normally enter a separation zone or cross a separation line.
A.including B.inclusive of C.except that D.other than
A proper look-out shall be maintained（）.A.only at night...
单项选择题A proper look-out shall be maintained（）.
A.only at night B.only during restricted visibility C.at night and during restricted visibility D.at all times
A proper look-out must be kept（）.A.only in fogB.only be...
单项选择题A proper look-out must be kept（）.
A.only in fog B.only between the hours of sunset and sunrise C.only when entering and leaving port D.at all times
