火灾前及火灾中短路熔痕的鉴别内容主要有（）
A.比较空洞
B.金相分析
C.检查短路熔痕数量
D.观察表面
参考答案：A, B, C, D
This memorial was built ______ those heroes who laid down their lives for the liberation of
the poor people.[ ]
A. in memory of
B. in charge of
C. in honour of
D. in need of
新颖性
