33.What is intended primarily for combustible liquids, and extinguishes a fire by floating on topof the liquid, thus isolating the liquid from a supply of oxygen?
(A)Halon
(B)Foam
(C)Seawater sprinkling system
(D)Carbon-dioxide

參考答案

答案:B
難度:適中0.589744
統計:A(2),B(23),C(9),D(5),E(0)

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