北京化工大学：《有机化学》课程教学资源（双语习题与答案）Chapter 05 Stereoisomers

北京化工大学：《有机化学》课程教学资源（双语习题与答案）Chapter 04 Cycloalkanes

北京化工大学：《有机化学》课程教学资源（双语习题与答案）Chapter 03 Reactions of Alkanes（Bond-Dissociation Energies, Radical Halogenation, and Relative Reactivity）

北京化工大学：《有机化学》课程教学资源（双语习题与答案）Chapter 02 Structure and Reactivity（Acids and Bases, Polar and Nonpolar Molecules）

北京化工大学：《有机化学》课程教学资源（双语习题与答案）Chapter 01 STRUCTURE AND BONDING IN ORGANIC MOLECULES

Chap. 7 other mechanisms Chap.7. Universal joints Chap. 7.2 Screw mechanisms Chap. 7.3 Transmission mechanism using friction Chap. 7.4 Mechanism with flexible elements Chap. 7.5 Hydraulic and pneumatic mechanism Investigate and Review by Students

1. retract [ ri5trAkt ]缩回,收回(to take back or withdraw) A cat can retract its claws. 猫能缩回爪子。 to retract an offer 收回提议

Word List 1. ban [bAn] (banned; banning)禁止, 取缔 (书刊等) (to prohibit esp. by legal means or social pressure.) Smoking is banned in school. 在学校禁止吸烟

w•1. defraud [ di5frC:d ]欺骗(to take something from by fraud; swindle; deceit) w•be defrauded of (one's estate) w被骗去(财产)

9.11 Overview of Animal Viruses 9.12 Retroviruses