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單項(xiàng)選擇題

他們應(yīng)該明白不同報(bào)警信號的意義。()

A. They should be clear about all fire-fighting equipment..
B. They should be understood about the meaning of the different alarm signals.
C. They should be clear about all life-saving equipment.
D. They should be clear about the meaning of the different alarm signals.

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