Australia has developed a fresh-keeping packaging film. An Australian company has developed a fresh-keeping packaging film, which can keep perishable fruits and vegetables fresh for several weeks
this packaging material has the following characteristics: 1? 郾 permeable membrane allows a proper amount of carbon dioxide gas and oxygen to pass through, so as to keep fruits and vegetables in a "dormant" state; 2? It contains an organic chemical substance, which can absorb the ethylene gas emitted by fruits and vegetables with ripening effect; 3? It can keep the air around the fruits and vegetables moist and remove the condensed moisture in the package; 4? A small amount of slow-release fungicide can inhibit the growth of mold
in this paper, why does metal fatigue cause damage? This is because the internal structure of the metal is actually uneven. The copyright belongs to the original work. Although the company structure has changed, it is only for everyone to share. Learn to make a fuzzy query on the historical test records according to the information of the submitting unit, test date, test sample and so on. If the author thinks that infringement is involved, please contact us, and we will delete it immediately after verifying that "1 point polyurea, 9 points construction"