端面拔动顶尖是我厂设计，开发和制造的机床附件，主要用于加工轴尖零件。
Constant face dirver is a dind of new type machine tool accessory designed and produced by our factory.
目的探讨应用多普勒组织成像（DTI）评价单纯性风湿性二尖瓣狭窄患者左室长轴收缩功能的意义。
Objective To evaluate Left ventricular long-axis systolic function in patients with rheumatic mitral stenosis by Doppler tissue imaging(DTI).
于左心长轴观、心尖或胸骨旁四腔观以及反流束横断面方位显示偏心性反流束的整体形态，评价二尖瓣的反流程度。
Its stereoscopic shape was observed in long views, the apical and parasternal four chamber views of left ventriculum and its regurgitant extent were estimated.
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