* @returns {number} - 当日价格的跨度
吉利与奔驰的合作，折射的是智能汽车时代，自主品牌技术反向输出的新趋势。
。关于这个话题，safew官方版本下载提供了深入分析
You might wonder why not just put everything that is “infrastructure related” in a dedicated directory inside the Business-Module. That’s the approach often taken in many designs in the wild, but the problem with such a weak separation is that it tends to erode (and after many months you discover that a business class peeks messages in a broker). Another problem is that it’s much harder to find the boundary for unit tests (whereas with BM and IM separated, you can just assume that the public API of BM is what should be unit tested).
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