Air Conditioning Systems Air conditioning has rapidly grown over the past 50 years, from a luxury to a standard system included in most residential and commercial buildings. In 1970, 36% of residences in the U.S. were either fully air conditioned or utilized a room air conditioner for cooling (Blue, et al., 1979). By 1997, this number had more than doubled to 77%, and that year also marked the
毕 业 设 计(论文 ) 外 文 翻 译 英文翻译题目一: PRECISION SEMIAUTOMATIC SPHERICAL TURNING LATHE FOR MACHINING PARTS OF BALL VALVES 英文翻译题目二: DEVICE FOR HARDENING THE COA TING ON MOLD BLOCKS 学 院 名 称: 机械工程学院 专 业: 机械设计制造及其自动化 班 级: 机制 082 姓 名: 林涛 学 号 08403010229 指 导 教 师: 杨超珍 2010年 11月 30 日 英文题目一 PRECISION SEMIAUTOMATIC SPHERICAL TURNING LATHE FOR MACHINING PARTS OF BALL V ALVES 翻译内容 指导教师评语 指导教师签字 年 月 日 英