复式记账凭证是根据复式记账法的原理填制，而单式记账凭证是根据单式记账法的原理填制( )
参考答案：错
—Who often helps you with your English?
—Mike ______. [ ]
A. be
B. do
C. does
D. go have
何首乌主含
A．黄酮
B．番泻苷
C．土大黄苷
D．二苯乙烯苷
E．香豆素
