Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Chemistry Chemistry in Everyday Life

निम्नलिखित पॉलिमर में पॉलिएस्टर है:

1
डैक्रॉन
2
नायलॉन-6
3
बैकेलाइट
4
नायलॉन 6, 6
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