【名词&注释】
肺动脉高压(pulmonary hypertension)、记录仪(recorder)、三尖瓣(tricuspid valve)、右心室肥大(right ventricular hypertrophy)、右心房(right atrium)、左心室肥大(left ventricular hypertrophy)、动态心电图仪、肺循环血流量(pulmonary circulatoryvolume)、研制成功(successfully developed)
[单选题]1957年,首先研制出动态心电图仪的学者是
A. WillemEinthoven
B. NormanJ.Holter
C. F.N.Willson
D. Frank
E. ArthurMaster