A:v(B2)=0.9mol/(L•s)
B:v(A2)=1.5mol/(L•s)
C:v(C)=0.62mol/(L•s)
D:v(B2)=90.0mol/(L•min)
Look! There are some birds _______ in the sky. They are very beautiful.
Lingling likes _____ a book. ( )
文明扩散论说认为有可能在此传播文明的包括( )
①埃及人 ②腓尼基人 ③以色列人 ④罗马人