1. Isitish uskunasi isitish va issiqlikni saqlash maqsadiga erisha olsa, elektr isitish, suv isitish isitish, ko'mir pechkalari va hatto kang, pol kang va boshqa isitish usullari tanlanishi mumkin, ammo shuni ta'kidlash kerakki, isitish ko'mir pechlari iflos va gazga moyil ...
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