多选Which forming technique（s） could be employed to process thermosetting plastics（）
A Extrusion
B Casting
C Blow molding
D Transfer molding
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单选Polyethylene pipes can be processed by（）
A Injection
B Extrusion
C Compression
D Blow molding
多选Which one （s） of the following is or are correct（）
A Isotactic and syndiotactic polymers possess stereo-regular structures
B Atactic and isotactic polymers possess stereo-regular structures
C Isotactic and syndiotactic polymers are rigid, crystallizable, high melting, and relatively insoluble
D Atactic polymers are rigid, crystallizable, high melting, and relatively insoluble
单选 which polymer has excellent elastic hysteresis（）
A SBR Styrene-butadiene rubber
B NBR Nitrile butadiene rubber
C PIP Polyisoprene
D IIR Butyl rubber
多选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
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