【多选题】光和物质相互作用的经典理论正确的有
A.
自发辐射过程采用 辐射阻尼谐振子 ,自发辐射衰减时间与阻尼系数成正比
B.
受激吸收和色散现象采用电场驱动力的 受迫谐振子 分析
C.
由于自发辐射的影响,增益或吸收谱线为 洛伦兹型
【单选题】A hundred years later, people learned to use some kind of technology at a factory, but
A.
these training and technology would last only a while.
B.
these training and technology would last all one's life.
C.
these training and technology would last all one's career.
D.
these training and technology were much more developed than before.
【简答题】Writing materials were (real) expensive and few people learned to read.
【单选题】( )是目前材料供应中采用较多的管理办法。
【单选题】将供应商分为公开竞价型供应商、网络型供应商和供应链管理型供应商,是根据( )的不同划分的。
【判断题】特许经营是一个典型模式,以统一的品牌名建立一个全国连锁加盟,但所有权和控制权属于地方。()