多选 The following factors which would cause the increase of Tg（）
A Rigid group, such as cyclic structures in the backbones
B Polar group, such as Cl and CN（Cyano group）
C Increasing of Mw
D Crystallites in the matrix
E Cross-linking
查看答案
多选Which forming technique（s） could be employed to process thermosetting plastics（）
A Extrusion
B Casting
C Blow molding
D Transfer molding
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
微信支付 
支付宝支付