射血分数是指
A．每搏输出量/心室舒张末期容积B．心输出量/体表面积C．心室收缩末期容积/心室舒张末期容积D．心输出量/心室舒张末期容积
参考答案：A
— _____ of Hangzhou has your brother covered since he came here?
— About half of it. I guess. [ ]
A. How far
B. How much
C. How wide
D. How many
