国际《火灾分类》中，按物质燃烧特性把火灾分为四类。其中( )指气体燃烧引起的火灾。
A．A类火灾
B．B类火灾
C．类火灾
D．D类火灾
参考答案：C
— I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.
— Oh, it __________ my younger sister. She was in my room at that moment.
A．must have been
B．should have been
C．could have been
D．may have been
战略管理的定义是什么？
