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
单项选择题 A proper look-out shall be maintained（）.
单项选择题 A proper look-out must be kept（）.
单项选择题 A head-on situation at night is one in which you see（）.
