28. Vulcanlsed rubber is an example of:
O a. Synthetic fibre and is made by mixing rubber and sulphur.
O b. Semi Synthetic fibre and is made by mixing rubber and sulphur.
O c. Synthetic fibre and is made by mixing molten rubber and molten sulphur.
d. Semi Synthetic fibre and is made by mixing molten rubber and molten sulphur.
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