心肌氧耗的多少取决于（）、（）和（），常用"二者乘积"即（）×（）作为估计心肌氧耗的指标。
参考答案：心肌张力；心肌收缩；强度心率；心率；收缩压
— I've heard that another brand of milk powder has been banned.
— It's a shame that some companies ________ the sense of social responsibility. [ ]
A. lack
B. expose
C. miss
D. reject
风险评估都要经过哪几个步骤？
