农村的田野上,丘陵的小山顶,铁路的桥梁旁边,海洋的小岛上等,这些地方往往耸立着测量标杆,最常见的是木制的三角架。可是,这些测量标杆常被一些不知它作用的人所毁坏,给国家的经济建设和科研工作带来不应有的严重损失。这些标杆叫测量标志。它是国 The fields in the countryside, the hilltops of the hills, the bridges along the railway, the islands of the ocean, etc. These places often stand for measuring poles, the most common being wooden tripods. However, these measurement benchmarks are often destroyed by people who do not know its role, and bring undue serious losses to the country’s economic construction and scientific research work. These benchmarks are called measurement signs. It is a country