“外色黑似铁，研粉红似血”是形容一种药材的特征，这种药材是
A．没药
B．乳香
C．血竭
D．鸡血藤
E．儿茶
参考答案：E
_____ useful advice he gave us! [ ]
A. How
B. What
C. What a
D. How a
顺纹抗压强度
