1、防护等级不同： KN95：对于0.075微米以上的非油性颗粒物过滤效率大于95%。 KP95：对于0.185微米以上的油性颗粒物过滤效率大于95%。
I\'m in the process of choosing database for my application. I have been using MySQL for the longest time but for my current application Performance and Scalability is important 开发者_如何学JAVAand I
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