問題詳情

19.The three basic elements necessary for any fire are .
(A)heat, gas and flame
(B)fuel, heat and oxygen
(C)heat, nitrogen and fuel
(D)fuel oil, nitrogen and oxygen

參考答案

答案：B
難度：簡單0.772727
統計：A(1),B(17),C(3),D(1),E(0)