题目

酒精的热值是3×107J/kg，它的物理含是： ______ ．完全燃烧10斤的酒精能放出 ______ J的热量． 答案：【答案】1kg酒精完全燃烧时放出的热量是3.0×107J1.5×108【解析】酒精热值是3.0×107J/kg，表示的物理意义是：1kg酒精完全燃烧时放出的热量是3.0×107J；完全燃烧10斤＝5kg酒精能够放出的热量Q＝mq＝5kg×3.0×107J/kg＝1.5×108J. 短文填空　阅读短文，然后从方框中选出可以填入文中空白处的单词。 Dear May, 　　Hi! I saw your name and address in‘Pen friends’magazine, and I would like to be your pen-friend．First, I will tell you some things about myself．My name is Sidney Li Pei-chun．I'm fourteen years 　　1　　．I'm about five feet 　　2　　．I have short black hair and brown eyes．My favourite 　　3　　 is playing computer games．I also enjoy 　　4　　 chess． 　　I live with my parents．They came to England about 30 years ago．They came from Hong Kong, but I have 　　5　　 been there．Now my parents 　　6　　 a Chinese restaurant in Newcastle．We live in a small house near our restaurant．I was 　　7　　 in Newcastle in 1986．I can speak Chinese, but I cannot write it very 　　8　　．I have a brother 　　9　　 Edwin．He is 23．He works 　　10　　 an architect, in London． 1．________　　2．________　　3．________　　4．________　　5．________ 6．________　　7．________　　8．________　　9．________　　10．________