单项选择题

The trim of a vessel is the （）.

A.value of the mean draft
B.degree of list
C.amount of roll
D.difference in fore and aft drafts

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The explosive range of a mixture of flammable vapors is specified as a percentage of （）.

A.flammable vapor by volume in air
B.oxygen present to support combustion
C.the temperature of the flash point
D.the lower limit of explosibility of the mixture

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A.They should wear safety shoes
B.They should wear ear protection
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D.all of the above