题目内容

多选Most polymers are flammable in their pure form, except___（）

A Poly（vinyl chloride）
B Polystyrene
C Polytetrafluoroethylene
D Polyimide

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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

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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

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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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多选Most polymers are flammable in their pure form, except___（）

A Poly（vinyl chloride） B Polystyrene C Polytetrafluoroethylene D Polyimide

In international air cargo transportation,（）are rates which are applicable to named types of air cargo

多选Fillers are most often added to improve tensile strength, and__（）

多选 The following factors which would cause the increase of Tg（）

多选Which forming technique（s） could be employed to process thermosetting plastics（）

A Poly（vinyl chloride）
B Polystyrene
C Polytetrafluoroethylene
D Polyimide