()(513—581),字子山。其诗歌创作依四十二岁留仕西魏为界分前后期。
参考答案:庾信
You have to keep on learning if you want to keep ______ with the development of modern science and technology.
A.peace
B.touch
C.pace
D.connect
燃气组分分析中,烷烃气体总量用()表示。
A.CnHm
B.CO
C.CH4