Which application is the second ring of the life-saving chain, indicated by the question mark (?) Below?

Which application is the second ring of the life-saving chain, indicated by the question mark (?) Below?

Which application is the second ring of the life-saving chain, indicated by the question mark (?) Below?

#ماهي
#النسبة
#القصوى
#لانبعاث
#غاز
#ثاني
#اوكسيد
#الكربون
#من
#المركبات؟
#pماهي
#المركبات؟p

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