English Name: welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections.
简体中文标题：焊接。钢、镍、钛和其合金的熔焊接头(束焊除外)。缺陷的质量等级。
2
Objective: To compare the clinical effects after root canal preparation with hand use stainless steel file, nickeltitanium alloy engine file and root canal ultrasonic file.
目的：比较手用不锈钢锉，镍钛合金机用锉和超声根管锉在根管预备后的临床效果。
3
Copper - nickel, nickeltitanium, copper - titanium, titanium - molybdenum, brass - copper, mild steel - copper and other dissimilar metal weld between.