15.1 Electrophilic aromatic substitution reactions These reactions are of the general type shown below;

12.1 Introduction Systems that have a p orbital on an atom adjacent to a double bond---molecules with delocalized pi￾bonds– are called conjugated unsaturated systems

《分子生物学》课程PPT教学课件（双语版）基因转录、调控、表达

《分子生物学》课程PPT教学课件（双语版）基因的转录、真核基因的表达调控、原核基因的转录与调控

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)

1 .背口诀记单词 天气非常fine (好的) 松鼠爬上pine (松树) 站成一条line (直线) 把松果油refine (提炼)* 发动汽车engine (发动机) 事迹搬上magazine (杂志)

1. re- : 重、再return, retreat, recall, regress 2. tri-: 三 tricycle, tricar, triweekly 3. multi-: 多 multiparty, multinational 4. dis-: 除去 disarm, disroot, discourage

I. Read the following sentences: 1.A monument was built to commemorate the victory. 2. The children huddled together for warmth

Chap.7.1 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

Chap. 6.1 Ratchet mechanisms Chap. 6.2 Geneva mechanisms Chap. 6.3 Cam-type index mechanisms Chap. 6.4 Intermittent gearset