负离子发生器的两个主要性能参数是负离子浓度和臭氧浓度。

Two major performance parameters of negative ion generator are negative ion concentration and ozone concentration.

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负离子发生器的两个主要性能参数是负离子浓度和臭氧浓度。

Two major performance parameters of negative ion generator are negative ion concentration and ozone concentration.

youdao