問題詳情

20.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0.833333
統計：A(1),B(15),C(0),D(1),E(0)