下列反应8NH3+3Cl2====6NH4Cl+N2中氧化产物和还原产物个数之比为( )
A.8∶3
B.3∶8
C.6∶1
D.1∶6
答案:D
氧化产物为N2,还原产物为NH4Cl。
一个数据库有多个外模式,有______内模式。
Raw materials is what we are badly _______ to develop the new plan.
A.in favor of
B.in hope of
C.in need of
D.in memory of