数字[shùzì]1、 基数词 Cardinals68 sixty-eight100 a/one hundred101 a/one hundred and two746 ven hundred and forty-six1,000 a/one thousand [a只用于一个数字的开头,后面有百位数时要用one]1,100 one thousand ,one hundred5,647 five
REFRIGERATION & AIR CONDITIONINGSYSTEM1. INTRODUCTION (1)2. TYPES OF REFRIGERATION AND AIR CONDITIONING (3)3. ASSESSMENT OF REFRIGERATION AND AIR CONDITIONING (9)4. ENERGY EFFICIENCY OPPORTUNITIES