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單項(xiàng)選擇題

A hygrometer is a device used for determining（）.

A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity

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A large oil fire on the deck of a ship can be fought most effectively with（）.

A.dry chemical
B.foam
C.high-velocity fog
D.water

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A life line must be conncted to the life raft（）.

A.at the bow
B.at the stern
C.in the middle
D.all around