(1) Qhov chaw siab tsis tshaj 2000 meters;
(2) Qhov kub ntawm qhov nruab nrab puag ncig tsis siab tshaj +40 ℃ thiab tsis qis dua -10 ℃;
(3) Cov av noo ntawm huab cua tsis ntau tshaj 85% (thaum lub sijhawm nruab nrab kub yog 20 ℃ ± 5 ℃);
(4) Cov chaw tsis muaj hmoov av paug;
(5) Ib puag ncig yam uas tsis muaj kev tawg;
(6) Ib puag ncig uas tsis muaj roj thiab vapors uas tuaj yeem corrode hlau thiab rwb thaiv tsev;
(7) Hauv qhov chaw tsis muaj nag lossis daus;
(8) Hauv qhov chaw uas cov dav hlau ntsug tsis nyob ntawm ntau tshaj 5 qib thiab tsis muaj kev vibration loj thiab cuam tshuam.