The stability of the AC MIG arc is closely related to the current before the polarity reversing point and voltage after that point.

指出交流MIG电弧稳定性与换向前的电流、换向后的电压有密切关系。

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The trouble that Mr Greenspan took to forewarn of reversing just one of those three rate cuts may still point to worries about the amount of borrowing in the system.

ECONOMIST: Greenspan lets things simmer