conn = sqlite3.connect(DB)
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
。旺商聊官方下载是该领域的重要参考
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（五）具有法律知识，从事法律、经济贸易、海事海商、科学技术等专业工作，并具有高级职称或者具有同等专业水平的。