关于respirators的百科

• respirators造句怎么写

• Air-purifyingrespiratorshavetwoadvantages.Children'sfacesmaybetoosmallfortherespiratorstofitproperlyandprovideprotection.Inhospitals,criticallyillpatientsarewrappedlikemummies,keptalivebyrespirators.Thenablackoutsweptoverthecity,shuttingdowntherespi...
• 2018-11-089906