属于相须的是()
A.石膏与知母配伍
B.黄芪与茯苓配伍
C.半夏与生姜配伍
D.人参与莱菔子配伍
E.甘草与海藻配伍
参考答案:A
— Could you please do some shopping for me, Mary?
— Sorry, I ______ my homework.
A.do
B.am doing
C.have done
D.was doing
各种业务信号复用进STM-N帧经历了()、()和()三个过程。