A.CygnusB.PegasusC.Ursa MajorD.AndromedaDeneb is found ……

单项选择题Define the acronym MSI（）.

A.Maritime Safety Information
B.Maritime Shipping Index
C.Maritime Satellite Indicator
D.Mariner Safety Intelligence

单项选择题Deficient oxygen content inside a chain locker can be detected with（）.

A.litmus paper
B.combustible gas indicator
C.oxygen breathing apparatus
D.oxygen indicator

单项选择题Deck beams on a ship are generally spaced at equal intervals and run（）.

A.longitudinally
B.vertically
C.transversely
D.intermittently

单项选择题Day-shapes must be displayed（）.

A.between sunset and sunrise
B.only between 8 AM and 4 PM
C.during daylight hours in any visibility
D.during daylight hours in unrestricted visibility only

单项选择题Daylight savings time is a form of zone time that adopts the time（）.

A.one zone to the east
B.one zone to the west
C.two zones to the east
D.two zones to the west