全屏显示专题章节

The scenario turned in favor of EVs in the early 1970s，as gasoline prices increased dramatically due to an energy crisis.The Arab oil embargo of 1973 increased demands for alternate energy sources，which led to immense interest in EVs.It became highly desirable to be less dependent on foreign oil as a nation.In 1975，352 electric vans were delivered to the US Postal Service for testing.In 1976，Congress enacted Public Law 94-413，the Electric and Hybrid Vehicle Research，Development and Demonstration Act of 1976.This act authorized a federal program to promote electric and hybrid vehicle technologies and to demonstrate the commercial feasibility of EVs.The Department of Energy（DOE）standardized EV performance，which is summarized in Table 1.3.

The case study of a GM EV of the 1970s is as follows（System and characteristics）:

Motor:separately excited DC，34 hp（1 hp＝735.498，75 W），2，400 r/m

Battery pack:Ni-Zn，120 V，735 lb

Auxiliary battery:Ni-Zn，14 V

Motor drive:armature DC chopper using SCRs；field DC chopper using bipolar junction transistors（BJTs）

Acceleration:0-55 mile/h in 27 s

The vehicle utilized a modified Chevy Chevette chassis and body.This EV was used mainly as a test bed for Ni-Zn batteries.Over 35，500 miles of on-road testing proved that this EV was sufficiently road worthy.

New words and expressions（单词和短语）

1.New words（单词）

2.Expressions（短语）

Notes to the text（难点解析）

★1.The scenario turned in favor of EVs in the early 1970s，as gasoline prices increased dramatically due to an energy crisis.20世纪70年代初能源危机使汽油的价格显著上升，电动汽车受到越来越多的青睐。

★2.This act authorized a federal program to promote electric and hybrid vehicle technologies and to demonstrate the commercial feasibility of EVs.这项条例制订了一个联邦计划，用来推进电动汽车及混合动力汽车技术的发展和阐述电动汽车商业化的可行性。

Exercises（练习）

◆1.Translate the following passages（expressions）into Chinese（英译汉）

（1）energy crisis

（3）It became highly desirable to be less dependent on foreign oil as a nation.

◆2.Translate the following passages（expressions）into English（汉译英）