問題詳情
51 In apparent backdraft conditions, the best time to attempt to enter is______ .
(A)immediately
(B)after ventilation has started
(C)before beginning of ventilation
(D)only after ventilation is completed
(A)immediately
(B)after ventilation has started
(C)before beginning of ventilation
(D)only after ventilation is completed
參考答案
答案：D
難度：適中0.407407
統計：A(7),B(6),C(3),D(11),E(0)
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