乌头毒性最强的成分是()
A.乌头胺
B.单酯型二萜类生物碱
C.去甲乌药碱
D.双酯型二萜类生物碱
参考答案:D
--I hear that the famous singer Eason Chan will sing at Beijing New Theatre.
--Really? Where did you _____?
A.take it out
B.pick it up
C.bring it about
D.get it in
热风炉属于哪个系统()
A、高炉本体
B、上料系统
C、喷吹系统
D、送风系统