题目

短文填空。Do you know Sweden？It l (1)in the north of Europe. It is the fourth largest country in Europe with an area of 450,000 square kilometers and a p (2) of about 8.5 million. Over one third of them live in the three largest cities, namely Stockholm, Goteborg and Malmo. More than half of Sweden is c  (3) with trees. It is one of the r (4) countries in the world. About 100 years ago Sweden became industrialized（工业化）. Today less than one third of the people are f(5).Sweden is the country where the world-famous Nobel Prizes are awarded. Many people who have been to Stockholm目前，“节能减排”已引起全球的关注．如何减少能耗，提高汽车发动机的效率越来越受到人们的重视，（1）大多数家用汽车的发动机均为汽油机，它把汽油燃烧产生的内能部分转化成机械能，再通过传动机构将动力传给车轮使汽车行驶．请你将图中汽油机工作时的能流图补充完整．（2）发动机的效率是汽车的经济性能指标之一．厂家提供的某汽车出厂的部分参数如下；①测试数据：汽车在平直公路上以90km/h的速度匀速行驶时，百公里耗油量为V（L），发动机输出功率为P（kW）；②使用燃料：93#汽油[热值为q（J/kg）、密度为ρo（kg/m3）]．请用以上参数推算出在测试条件下，该汽车发动机的效率．