影响心肌收缩力的主要因素是（）。
A.每搏输出量
B.活化横桥数和肌凝蛋白的ATP酶活性
C.心指数
D.心输出量
E.射血分数
参考答案：B
Though the famous dancer TanLihua, is deaf, she dances _____ most of the people.[ ]
A. as good as
B. as well as
C. best among
D. better than
离退休职工的易地安家补助费属( )。
A．工会经费
B．劳动保险费
C．社会保障费
D．职工福利费
