• 1. joint efficiency factor: 接合效率因数
• 2. Joint Efficiency Factor for: 焊缝系数
• 3. Welded joint efficiency factor: 焊接接头系数

• 1.It is proved that, frequency conversion has excellent accent speed, a brake capability, high efficiency rate, great credit rate factor and joint electricity effect and other merits.
  实践证明，变频调速具有优异的调速和起制动性能，以及高功率因素和高效率的节电能力等优点，而被国内外公认为最有发展前途的调速方式。
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