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
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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 -
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Dacron sails,when not in use,may be damaged if().
A.left in the sunlight
B.stowed wet
C.washed with soap
D.folded frequently
