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單項選擇題

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

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單項選擇題

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

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

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