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?