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。
What are the main lakes in Hei Long jiang?
简介黑龙江省主要的湖泊有哪些？
What are the main lakes in Hei Long jiang?
简介黑龙江省主要的湖泊有哪些？
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