The pulsed current peak value and EP time have a important effect on removal of the surface oxide, the lower frequency should be adopted for thin sheet of aluminium alloy.
脉冲电流幅值和EP半波时间对铝合金表面氧化膜的清理有重要影响，在焊接薄板铝合金时应采用较低的脉冲频率。
Current weak EP test comes to 10-13 by the rotating torsion balance and Lunar laser ranging methods.
地面旋转扭秤法和地月测距方法在10 - 13精度内验证弱等效原理依然成立。
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