單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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