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Parts-per notation - Wikipedia, the free encyclopedia
瀏覽:941
日期:2026-04-26
One part per million (ppm) denotes one part per 1,000,000 parts, one part in 106,
1/1,000,000 * 100% = 0.0001% (or 1% = 10,000 ppm), and a value of 1 × 10−6....看更多

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