Nylon, a synthetic →adonefrom →b a combination of water, air and a by -product→c of coal was frist →dintroduced in 1938.

Question

Nylon, a synthetic →adonefrom →b a combination of water, air and a by -product→c of coal was frist →dintroduced in 1938.

Accepted Answer

সঠিক উত্তর: a। ব্যাখ্যা:

$Nylon, a synthetic \to_{a}^{d o n e} from \to_{b}^{a combination} of water, air and a by - product \to_{c}^{of coal} was frist \to_{d}^{introduced} in 1938 .$