defence exam INET Mock Test General Knowledge Geography (World Geography) Climatology

ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟି ଏକ ଓଜୋନ ହ୍ରାସକାରୀ ପଦାର୍ଥ (ODS) ଭାବରେ ବିବେଚନା କରାଯାଏ?

1
CFC (କୋଲ୍ରୋଫ୍ଲୋରୋକାର୍ବନ୍)
2
ହାଲୋନ୍ସ
3
ମିଥେନ୍
4
ଉପରେ ଥିବା ସମସ୍ତ
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