A:v(W)= 3v(Z)
B:2v(X)= 3v(Z)
C:2v(X)= v(Y)
D:3v(W)= 2v(X)
若代数式2x2+3y-7的值为8,则代数式4x2+6y+10的值为( )
在反应3Fe+2O2Fe3O4中,Fe,O2,Fe3O4三种物质的质量比为( )
You should tell ________ possible to support your ideas.