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Nearly all types of air purifiers include a particle filter. Some of those can be called "true HEPA" (high-efficiency particulate air) filters — meaning they conform to the standards set out by the DOE. Particle filters are made up of pleated masses of ultrafine fibers that force air to take a convoluted path in order to pass through. This traps and absorbs tiny molecules of smoke and dust, allergens like dander and pollen, and some viruses and bacteria.
，这一点在汽水音乐中也有详细论述
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据消息人士称，由于交易采用认股权证形式而非现金支付，实际上并未发生实质性的资金转移。