【单选题】what does Eric like according to the dialogue?
【单选题】What does Eric mean by saying “ The grass is always greener ”?
A.
People always envy others.
B.
Work makes life colorful.
C.
People should look at the bright side of life.
【多选题】若采用向生产厂家订购的设备采购方式,则订购前应做好厂商的评审和实地考查,主要包括( )。
【单选题】关于激发光谱与发射光谱的关系,下列说法正确的是( )。
A.
不管激发波长如何,电子都是从第一电子激发态的最低振动能级跃迁到基态的各个振动能级
B.
与荧光发射波长相比,激发波长更长,即产生所谓Stokes位移
C.
荧光光谱形状与激发波长有关,在不同的激发波长下,荧光光谱形状不同
【单选题】What does the passage tell us about fire fighter Eric Velez?
A.
He travels all over America to help put out fires.
B.
He often teaches children what to do during a fire.
C.
He teaches Spanish in a San Francisco community.
D.
He provides oxygen masks to children free of charge.
【多选题】货物招标中,催交的工作内容包括( )。
D.
评估供货厂商的生产成本是否控制在合理的范围内
【简答题】1930年到1931年,在红一方面军三次反“围剿”斗争胜利的基础上形成()