收涩药的共同功效是
A.收涩固脱B.固精缩尿C.敛肺止咳D.涩肠止泻E.固表止汗
参考答案:A
The magician’s talk creates a (n) ______ of attention so that the audience does not see how he does his tricks.
A. diversion B. derivation C. disorder D. interference
汽轮机冷态启动定速并网后加负荷阶段容易出现负胀差。