晶闸管在应用中当阳极加上正电压,阴极加负电压时,若控制极(阴极间)加一定的正向电压,可控硅处于()。
A、发射状态
B、导通触发
C、恢复阻断
D、阻断状态
参考答案:B
计算息税前利润时要扣除固定成本,因为利息属于固定成本,故利息也应扣除。 ( )
How do you understand the relationship between the grammatical forms of a language and their communicative functions