Realist fiction becomes popular in English literature in the ____（）
A. 17th century
B. 18th century
C. 19th century
D. 20th century
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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
A. General Cargo Rates
B. Class Rate
C. Bulk Unitization Rates
D. Specific Commodity Rates
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
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