問題詳情

9.Which type of gas is used to extinguish fires by reducing the oxygen concentration of the airsurrounding the fire?
(A)Hydrogen
(B)Helium
(C)Carbon-dioxide
(D)Carbon fuel

參考答案

答案：C
難度：適中0.654545
統計：A(23),B(6),C(72),D(8),E(0)