RRB ALP 2013 প্রশ্ন 22
প্রশ্ন: বায়ু দূষণের প্রধান উপাদান হলো:
বিকল্প:
A) সীসা
B) তামা
C) জিঙ্ক
D) সোনা
Show Answer
উত্তর:
সঠিক উত্তর: A
BETA
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