目的评价超声心动图对室间隔缺损定位诊断和缺口大小定量诊断的准确性。
Objective To evaluate the accuracy of echocardiography in assessment of the location and size of ventricular septal defect.
在工作过程中，冲头与凹模切口的半径定位，确保形成所需的圆形，而不至于在圆边产生“缺口”。
The radius of the punch and die cutting edges is laid out to produce the desired circular shape without nicking into the circle as the work proceeds.
有一个刀尖与缺口内的凸台相接触，另有一个与其相邻的刀尖与缺口侧面相接触，起到定位的作用。
One of the tool tips is in contact with a projection in the notch, and the other one is in contact with the adjacent tool tip and the lateral side of the notch for the positioning.
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