engineering recuitment RVUNL Technician III Mock Test Series 2025 General Science Chemistry

निम्नलिखित में से कौन सा तापदृढ बहुलक है?

1
बेकेलाइट
2
ब्यूना-n
3
नायलॉन 6
4
PVC
5
नायलॉन 6,6
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