川芎的功效为（）
A. 活血行气，解郁清心
B. 活血行气，祛风止痛
C. 活血调经，凉血消痈
D. 活血行气，止痛
We can obviously notice that over a period of no practice, what has been learned tends to be forgotten from________________________.
The biggest barrier to sounding the alarm about bird flu is that people usually take flu seriously.
硫代硫酸盐
A. 先用硝酸或溴水氧化
B. 先加酸性氯化亚锑还原
C. 改用白田道夫法
D. 先加氰化钾掩蔽
E. 先加草酸生成沉淀
微信支付 
支付宝支付