治疗肺炎喘嗽风热闭肺证的最佳选方为()
A.桑白皮汤
B.清金化痰汤
C.桑菊饮
D.麻杏石甘汤
E.银翘散合麻杏石甘汤
参考答案:E
流体在圆形管道中流动,无论层流或紊流,管壁处流体速度均为零。
In capital markets, stock dividends and bond coupons generally provide what is referred to as:()
A. current yield.
B. capital gain yield.
C. internal yield.