【单选题】
进入危险作业区域的抢险救援，要备足预备力量，通常按___比例做好充分准备，以应对意外事故发生时的紧急处置。
A. 1：2
B. 1：1
C. 2:1
D. 2:2
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答案
B
解析
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扑救炼油厂火灾时，对受火势威胁或热辐射作用的邻近设备和装置，应及时采取___等措施。
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通过烟的___等特征，消防人员可以大致判断燃烧物质的种类、火灾阶段、火势蔓延方向等。
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