A.HydrusB.LeoC.CentaurusD.AquilaDenebola is found in wh……

单项选择题Deneb is found in what constellation?（）

A.Cygnus
B.Pegasus
C.Ursa Major
D.Andromeda

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