激素的第二信使不包括()
A.PIP2
B.cAMP
C.DG
D.Ca2+
E.lP3
参考答案:A
Computers are very popular now and they are _______ than before.
A. cheap
B. cheaper
C. cheapest
D. the cheapest
青蒿素的药理作用
A.对红细胞内期滋养体有杀灭作用B.对红细胞外期有效C.心动过速D.抗血吸虫E.子宫兴奋作用