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预应力混凝土轨枕问世已有30多年。在这期间研究出了多种形式的轨枕。到目前为止,适应不同条件的各种轨枕共铺设了大约1,700
Prestressed concrete sleepers come out more than 30 years. During this period many forms of sleeper were developed. To date, about 1,700 sleepers have been installed to suit different conditions