咳血方主治证的病机是()
A.肝火犯肺,灼伤肺络
B.脾阳不足,统血失常
C.阴虚火旺,损伤肺络
D.血热妄行,损伤肺络
E.心脾两虚,气不摄血
参考答案:A
-- Hi,Mike! I haven’t seen you for a long time. ?
--- Everything is OK. Thanks.
A.How are you
B.What’s wrong
C.Where have you been
D.How’s it going
求曲面z=x2+2xy+4y2在点(1,-2,13)处的切平面及法线方程.