大蓟的功效是
A.凉血止血,散瘀消痈
B.凉血止血,解毒消痈
C.凉血止血,解毒敛疮
D.凉血止血,清热疗疮
参考答案:A
It is ______ to work out this problem. You needn't be worried. [ ]
A. enough easy
B. easily enough
C. easy enough
D. very easily
完成下列变化的化学方程式,并注明反应类型.
①______(氧化还原反应);
②______(置换反应);
③______(化合反应);
④______(置换反应).