Introduce the famous historical and cultural city in Hei Long jiang?
请介绍一下黑龙江省的国家及省级历史文化名城？
What are the main ski yards in Hei Long jiang at present?
目前黑龙江省主要滑雪场有哪些？
The paper studies the characteristics of traffic safety of high-grade highway in cold areas, according to traffic accident data of high-grade highway in Hei Long Jiang province.
研究了以黑龙江省为代表的寒区高等级公路交通安全特性。
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