下列四个方程中,表示衰变的是:( )
A.
B.
C.
D.
答案:A
反应后有粒子产生的衰变为衰变,A对;
It was a pity that he __ blind, but to the joy of his family, his dream of becoming a musician _____ true at last.
A.came; came
B.went; went
C.came; went
D.went; came
抗凝血酶Ⅲ抗凝的作用机制是
A.除去血浆中的Ca2+,实现体外抗凝
B.封闭某些凝血因子的活性中心
C.抑制血小板的作用
D.抑制X因子激活
E.增强其他抗凝蛋白质的抗凝活性