秘书出具介绍信时,要将各项内容填写清楚并与存根一致,加盖()。
A.骑缝章
B.密封章
C.收发章
D.号码章
参考答案:A
We often provide our children with toys, footballs or basketballs, ______ that all children like these things. [ ]
A. thinking
B. think
C. to think
D. thought
活动星系核相比于一般的星系核,有哪些突出的特征?()
A、高光度(射电波段)
B、热连续辐射
C、弱发射线(金属线)
D、宿主星系较为明亮