老人精血俱亏,病及督脉,发为癃闭,应选用的最佳处方是
A.香茸丸
B.大补阴丸
C.六味地黄丸
D.补中益气汤合春泽汤
E.千金温脾汤合吴茱萸汤
参考答案:A
_____________ you help me with it? I _____________ not finish it in time. [ ]
A. May; may
B. Can; can
C. Must; must
D. Should; should
叶片的安装角度是影响水泵性能曲线的一个因素