Which ones of the following are correct?
A.Trans-polyisoprene is more readily packed and crystallizable, and has properties of crystalline polymers.
B.Cis-polyisoprene is more readily packed and crystallizable, and thus has properties of crystalline polymers.
C.Trans-polyisoprene is tougher and harder than cis-polyisoprene
D.Cis-polyisoprene is tougher and harder than trans-polyisoprene
正确答案：Trans-polyisoprene is more readily packed and crystallizable, and has properties of crystalline polymers.；Trans-polyisoprene is tougher and harder than cis-polyisoprene