單項選擇題

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

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單項選擇題

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

單項選擇題

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

Day-shapes must be displayed（）.

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Daylight savings time is a form of zone time that adopts the time（）.

Dacron sails，when not in use，may be damaged if（）.

Dacron sails，when not in use，may be damaged if（）.