大黄泻下通便,正确的用法是
A.伤阳助寒 B.伤阴助火 C.收敛邪气 D.伤津败胃 E.助湿满中
参考答案:C
As he ________ in the river for five hours, the thief looked very pale and hopeless. [ ]
A. trapped
B. has been trapped
C. trapping
D. had been trapped
红霉素以游离分子形式存在时,可用吸附法分离,吸附时发酵液的pH应调节()。
A.大于7
B.小于7
C.等于7
D.2~12