單項(xiàng)選擇題

（）is best for electrical fire.

A. Dry extinguisher
B. Power extinguisher
C.A+B
D. CO₂ extinguisher

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單項(xiàng)選擇題

Which of the following is not the emergency equipment?（）

A. Emergency power supply.
B. Quick-close device.
C. Emergency squad.
D. derricks.

單項(xiàng)選擇題

Which of the following is not the life-saving equipment? （）

A. Lifeboat.
B. Life-raft .
C. Life rail.
D. Lifebuoy.