心血池显像所计算的参数中，最常用的心室收缩功能的参数是（）
A.LVEF
B.PER
C.TPE
D.PFR
E.TPF
参考答案：A
He could neither _______ French nor German . So I _______ with him in English. [ ]
A. speak, talked
B. talk, told
C. say, spoke
D. tell, talked
有机硼可当作破乳剂来添加到压裂液中。（）
