China has done what it can to assist other countries fighting their battles with the virus and promoted international solidarity.

1. Distinguish from packagingGenerally, there are different technical standards for the three kinds of respirators, namely, disposable medical respirator (YY / t0969-2013), medical surgical mask (yy0469-2011) and medical protective mask (gb19038-2010). You can judge which type of mask the product be

China may achieve positive economic growth this year despite the impact of the novel coronavirus pandemic, and still has ample policy room to keep the world's second-largest economy on a steady track of growth, Premier Li Keqiang said on Thursday.

Optical BrightenersOptical brighteners are used to mask the inherent yellowness of plastics and are used to improve colors and make plastic look whiter and brighter. These are generally added to enhance the esthetics . Optical brighteners are often used in conjunction with other colorants to achieve

1. Distinguish from packagingGenerally, there are different technical standards for the three kinds of respirators, namely, disposable medical respirator (YY / t0969-2013), medical surgical mask (yy0469-2011) and medical protective mask (gb19038-2010). You can judge which type of mask the product be