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單項(xiàng)選擇題

Which one is not the personal safety equipment?（）

A.Life jackets
B.Survival at Sea manual
C.lifeboat
D.torch

單項(xiàng)選擇題

Water is a very effective fire extinguishing agent because it（）

A.will remove all the toxic fumes from the air
B.has the greatest cooling ability
C.will leave no harmful residue
D.completely removes combustible vapors from the air