宜先煎的药材是()
A.附子
B.薄荷
C.菟丝子
D.阿胶
E.三七粉
参考答案:A
解析:
附子含毒性成分,先煎可消除毒性。故答案选A。
集合A={a2,a+1,-1},B={2a-1,|a-2|,3a2+4},A∩B={-1},则a的值是( )
A.-1
B.0或1
C.0
D.2
It does not look like rain, so you _______ bring your umbrella with you. [ ]
A. shouldn't
B. mustn't
C. can't
D. needn't