既能活血止痛，又能化瘀止血的药物是（）
A.延胡索
B.白及
C.穿山甲
D.槐花
E.五灵脂
参考答案：E
As a good speaker, it is important that you get your message to listeners.
A．through
B．across
C．toward
D．forward
一次结晶的晶粒越粗大，柱状结晶的方向越明显，则产生冷裂纹的倾向也越大。
