Civil Services 71st BPSC CCE (Preliminary) Test Series 2025 General Knowledge Geography (World Geography) Geomorphology

পৃথিবীর ভূত্বকের ওজন অনুযায়ী অক্সিজেনের আনুমানিক শতাংশ কত?

1
46.6%
2
19.6%
3
16.6%
4
36.6%
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