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單項選擇題

The class of fire on which a blanketing effect is essential to extinguish the fire is （）.

A.class A
B.class B
C.class C
D.class D

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單項選擇題

Which of the listed classes of fire is considered as one involving electrical equipment?（）

A.Class "A"
B.Class "B"
C.Class "C"
D.Class "D"

單項選擇題

Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）

A.Chain reaction
B.Thermal action
C.Chemical occlusion
D.Pyrotechnical reaction

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