# 常规

- [Velogic 的支持政策](https://docs.velogicfit.com/zh/chang-gui/support-policy.md): Velogic 以电子邮件优先的支持政策以及如何获取帮助
- [使用 Bar XY 笛卡尔坐标](https://docs.velogicfit.com/zh/chang-gui/bar-xy-coordinates.md): 关于在自行车拟合和车架比较中使用 Bar XY 笛卡尔坐标的完整指南。了解 Reach 和 Stack 指标，以及为什么 Bar XY 能提供更准确的车架尺寸。
- [下载账单明细](https://docs.velogicfit.com/zh/chang-gui/downloading-statements.md): 如果你需要用于会计记录的详细账单明细，可以通过我们的网站下载。
- [更换信用卡](https://docs.velogicfit.com/zh/chang-gui/changing-credit-card.md): 如果你的信用卡过期，或者你需要更改用于 Velogic 订阅的信用卡，你可以通过我们的网页应用轻松自行完成。


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.velogicfit.com/zh/chang-gui.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.