Methods 25 patients who had foreign body inside the digestive tract but the X-ray exploration was negative, were exarnined with ultrasonic inspection with high and Iow frequency detecting head.
方法对25例有明确异物吞入史，但X线探查为阴性的患者，运用超声高、低频探头对可疑部位进行探查定位。
Therefore we have the mouth of the head in high frequency KU below when it's raining, so there would be rain shower our KU head of the plastic cover.
从而使我们的KU高频头的口在下面，这样在下雨时也就不会出现雨水打淋我们的Ku头上的塑料盖。
Tapping in the former Soviet Union is the major research high-frequency tapping, tapping developed a dedicated ultrasound machine and the corresponding axial ultrasonic head.
前苏联在攻丝方面主要研究的是高频攻丝，研制有专用轴向超声攻丝机床和相应的超声头。
When the utility model is operated, the electricity cutting switch is pressed, and an electric cutter head generates high frequency electric cutting current;
操作时，按动电切开关，电刀头即产生电切高频电流；
When the utility model is operated, the electricity cutting switch is pressed, and an electric cutter head generates high frequency electric cutting current;
操作时，按动电切开关，电刀头即产生电切高频电流；
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