Monomers used for producing polymers should be（）.

A.Unsaturated monomers　

B.Monomers containing carbon-carbon double or triple bonds

C.Saturated monomers　

D.Saturated monomers having more than 2 reactive groups　

正确答案：Unsaturated monomers　 ；Monomers containing carbon-carbon double or triple bonds ； Saturated monomers having more than 2 reactive groups