1. 概述 ................................................................................................................ 12 2. 麦克风 .............................................................................................................. 12 3. 音量 .............................................................................................................. 13 4. 快照 .............................................................................................................. 13 5. 全屏 .............................................................................................................. 14 6. 放大和缩小 ...................................................................................................... 14 7. 对焦 ............................................................................................................. 15 8. 刷新对焦 ...................................................................................................... 15 4 图像和图像参数 ............................................................................................. 15