单项选择题

（）is best for electrical fire.

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

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单项选择题

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

单项选择题

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

单项选择题

A. Put on my life-jacket.
B. Go to muster station.
C. A+B
D. Rig the lifeboat and report.