Just use the memory key A is for ash. Anything that leaves an ash is a class A fire. So paper, wood, cloth would all be good examples of class A fires. Class B is liquids such as gasoline or oil. Class C is electrical fires and class D is a special class for metals that burn such as magnesium.
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Rubber, wood, paper or plastic
No, binary numbers don't consist of ones and twos, they are ones and zeros.
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