1. Tshem tawm qhov sib dhos nrog cov roj nitrogen kom tsawg li 1 feeb.
2. Kev kuaj airtightness yuav tsum yog siv cov pa roj nitrogen ntshiab.
3. Tom qab dhau qhov kev ntsuam xyuas airtightness, qhwv nws thiab kaw nws nrog lub hau huv polyethylene. Ua ntej siv lub kaus mom polyethylene, muab tso rau hauv cov kuab tshuaj organic thiab so kom huv si.
4. Tom qab ntawd muab khi nrog lub hnab nqus.
5. Kev ntim khoom zaum kawg.
6. Thaum lub sij hawm kev thauj mus los, kev ntsuas yuav tsum tau ua kom ntseeg tau tias lub ntim tsis puas.
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