單項選擇題

A.jumping over today
B.backing to yesterday
C.jumping over tomorrow
D.backing to the day before yesterday

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A.KG is increased
B.KG is decreased
C.Kgis not affected
D.KG increases at light drafts and decrease at deep drafts

A.litmus paper
B.a combustible gas indicator
C.an oxygen breathing apparatus
D.an oxygen indicator