阿摩線上測驗
47 Portable fire extinguishers are categorized by ______.
(A)the cost of the extinguisher
(B)who is able to use the extinguisher
(C)the types of fire for which they are intended
(D)whether they are for commercial or residential use
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統計： A(12), B(33), C(83), D(26), E(0) #1200263
統計： A(12), B(33), C(83), D(26), E(0) #1200263