正[负]极性
Syntax and Semantics of Negative Polarity Items in English and Mandarin Chinese
英汉语中负极词的句法及语义研究
The result showed that it is in the period of droplet growth at the tip of welding wire that an electrochemically gained oxygen was produced in the case of direct current negative polarity whereas an electrochemically lost oxygen in positive polarity.
结果表明,在焊丝末端熔滴生长阶段,直流反极性条件下存在电化学增氧,而直流正极性条件下则存在电化学脱氧。
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