That is done using ultrasound, which is generated by a box called a pulse-generator that is similar in size to a pacemaker box, but is inserted lower down in the chest (see illustration).
这个问题可以通过使用超声波来解决，也就是利用一个大小和心脏起搏器差不多，名为“脉冲发生器”的盒子来完成，但是它需要被放在胸腔下部(如上图所示)。
Aiming at the technology demand of advanced copper interconnection, the effect of pulse current density on cu layer properties such as resistance, crystal size and surface roughness were investigated.
针对先进纳米铜互连技术的要求，研究了脉冲电流密度对铜互连线电阻率、晶粒尺寸和表面粗糙度等性能的影响。
Then the amplitude threshold is established combined with detection probability. The method of ascertaining pulse number threshold is analyzed according to orientation requirement and target size.
在此基础上，结合探测概率制定幅度门限，根据定位要求及目标尺寸，分析了脉冲个数门限的确定方法。
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