The effect of tiny ball at wiretip on the successful rate of arc striking and the effect of the wire slow feeding on striking result are studied.
研究了焊丝端头小球对引弧成功率的影响; 研究了慢送丝对引弧效果的影响;
2
By adding a guide wire to the tip of a standard IV catheter, Amir Belson invented an IV that won't poke vein walls by accident, a problem that can cost hospitals thousands of dollars a week.