📚 IGCSE Cambridge Engineering: Unit Test Mock Paper Walkthrough | IGCSE剑桥工程：单元测试模拟卷解析
This walkthrough breaks down a Cambridge IGCSE Engineering unit test mock paper, question by question, so you can see exactly how marks are awarded and where students often lose them.
本解析将逐题拆解一份剑桥 IGCSE 工程单元测试模拟卷，帮助你准确了解评分方式以及学生常见失分点。
1. Exam Paper Overview | 模拟卷概览
The mock paper is designed to last 60 minutes and carries 50 marks. It covers materials, mechanics, energy, electrical systems, manufacturing and drawing conventions.
该模拟卷建议用时 60 分钟，总分 50 分，覆盖材料、力学、能量、电气系统、制造工艺和制图规范。
Each question begins with a short context, such as a bridge support, a lifting mechanism or a motor circuit. You are expected to apply knowledge, perform calculations and justify choices.
每道题都从简短的工程情境入手，例如桥梁支座、起重机构或电机电路。考生需要应用知识、完成计算并说明选择理由。
| Section | Topic | Marks | 中文主题 |
| A | Materials and properties | 8 | 材料与性能 |
| B | Forces and moments | 10 | 力与力矩 |
| C | Energy and power | 8 | 能量与功率 |
| D | Electrical circuits | 9 | 电路基础 |
| E | Mechanical systems |
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