问题
单项选择题
Fire may be spread by which means?（）.
A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above
答案
参考答案：D
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Fire may be spread by which means?（）.
A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above
参考答案：D