“外色黑似铁,研粉红似血”是形容哪种药材的特征
A.乳香
B.没药
C.血竭
D.鸡血藤
E.儿茶
参考答案:C
Poor packing will cause much trouble()delivery.
A.at
B.for
C.in
D.on
设计注射模时,应对注射机哪些工艺参数进行校核?