Tony Wheeler was born to travel. His father worked for an airline. For the first 16 years of his life，Wheeler and his family lived in many different countries.
     In the early 1970s，Wheeler met a young woman named Maureen. They soon married. Before getting jobs， Tony and Maureen wanted to travel. They took a year-long trip from London，through Asia，to Australia. On the trip，they visited places like India， Iran， and Afghanistan.
     When Tony and Maureen arrived in Australia，people asked many questions about their trip. To answer these questions，Wheeler wrote a guidebook called Across Asia on the Cheap . The book told people about different countries' weather，customs(风俗），and places to see. But unlike travel guides in the 1970s，Wheeler’s book also talked about places most tourists did not go. He also wrote about unusual things to see and do. The book was very popular．
     Wheeler and Maureen started a company called Lonely Planet. They continued travelling. They wrote guidebooks for each place they visited. Today，400 people work for Lonely Planet. The company has over 650 guidebooks. Wheeler still writes about travel “hot spots” (for example，Cambodia in Asia and Croatia in Europe). For more information，read the books!

阅读下面的语段，完成练习。 

 轰！巨大的爆炸声震撼着大地，滚滚浓烟从实验室里涌出来。人们慌忙赶来，齐声惊呼：“诺贝尔完了！诺贝尔完了！” 

突然，一个满身鲜血的中年人冲出浓烟，高举双手呼喊着：“成功了！成功了！”他，就是诺贝尔。 

阅读材料回答问题

材料一：英国占领了香港岛，英、法、美等国在上海等地开辟租界，中国的领土和主权开始遭到破坏。五口通商后，鸦片走私的情况更加严重。资本主义国家的工业品倾销到中国市场，使中国的家庭手工业遭到破坏，小农经济逐渐破产。

材料二：割辽东半岛、台湾、澎湖列岛给日本；赔款日本军费白银2亿两；允许日本在中国开设工厂；增辟通商口岸。

材料三：清政府赔款白银4.5亿两……清政府保证严禁中国人民参加反帝活动；拆毁大沽炮台……划定北京东交民巷为使馆界，允许各国驻兵保护，不准中国人居住。

请回答：

如图所示，斜面长5m，高1m，工人用沿斜面方向400N的力把重1600N的箱子匀速推到车上，推力对箱子做的功是____J，斜面的机械效率是____．