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问题 问答题

怎样才能有效提高热机的效率？有什么重要意义？

答案

改进热机结构和性能，减少各种热损失；保持良好的润滑，减少摩擦从而减少已经获得的机械能的损失；改进燃烧条件，尽可能地使燃料充分燃烧，这些都是提高热机效率的重要方法。提高热机效率可以降低消耗，提高经济效益，同时还可以大大地节约能源。（答案不唯一）

问答题

Pious, a Church Minister, asked one of his parishioners Short, an accountant, to prepare the fi nancial statements for the church. Short agreed to perform the service at no charge. He instructed a trainee accountant, Bruce, to do the work but not to spend too much time at it.Bruce immediately worked on the assignment but he did not follow ordinary accounting procedures, which would have revealed that a church employee, Smart Alec, was regularly stealing from the church’s funds. This carried on for two years and the church lost $20,000 due to Smart Alec’s stealing.Required:In relation to the law of obligations explain whether Short would be liable to the church for the sum of $20,000·00 for failing to timeously discover Smart Alec’s fraud. (10 marks)
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选择题

下图是我国升空发射的第一颗卫星，它的名称是  [ ]

A、长征1号

B、东方红1号

C、神舟1号

D、探索者1号
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