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單項(xiàng)選擇題

（）is a/an aircraft used in SAR.

A.MRCC
B.SOSREP
C.MCA
D.3A

單項(xiàng)選擇題

Which statement about firefighting foam is TRUE?（）

A.Foam conducts electricity
B.To be most effective，foam should be directed at the base of the fire
C.Foam is most effective on burning liquids which are flowing
D.Foam can ONLY be used to extinguish class A fires