单项选择题
A.longitudinally B.vertically C.transversely D.intermittently
Day-shapes must be displayed（）.A.between sunset and sun...
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
Daylight savings time is a form of zone time that adopt...
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
Dacron sails，when not in use，may be damaged if（）.A.left...
单项选择题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
