In international air cargo transportation,（）are rates which are applicable to named types of air cargo
A. General Cargo Rates
B. Class Rate
C. Bulk Unitization Rates
D. Specific Commodity Rates
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多选Fillers are most often added to improve tensile strength, and__（）
A Compressive strength
B Cost
C Abrasion resistance
D Toughness
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
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
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