diff --git a/doc/计算机系统工作原理-文档.docx b/doc/计算机系统工作原理-文档.docx
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diff --git a/src/USBTest.java b/src/USBTest.java
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+++ b/src/USBTest.java
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+package edu.eurasia.Interface;
+
+public class USBTest {
+    public static void main(String[] args) {
+        // 1. 创建电脑对象
+        Computer computer = new Computer();
+
+        // 2. 连接USB设备
+        computer.add(new UMouse());
+        computer.add(new UMic());
+        computer.add(new UKeyBoard());
+
+        // 3. 开机/关机测试
+        computer.powerOn();
+        computer.powerOff();
+    }
+}
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