五、试验基地和测试设备开展科学研究工作,需要有良好的试验条件,和精确的测试手段。有些问题可以运用数学推理的途径。但是其结果还需要通过实践来验证。在接触网领域内的许多实际问题,都需要通过试验台和试验线路来做大量的试验,才能对理论分析遇到的困难问题的发生发展过程和外界影响得到解决。因此各国有许多科学工作者专门从事接触网 Fifth, the test base and test equipment to carry out scientific research, the need for good test conditions, and accurate test methods. Some problems can be solved using mathematical reasoning. But the result still needs to be verified through practice. Many practical problems in the field of catenary networks require a large number of experiments to be conducted through test rigs and test lines so that the development process and the external influences on the difficult problems encountered in theoretical analysis can be solved. That is why many scientists in all countries specialize in catenary