流速仪是水文测驗工作中的主要仪器,各省、(市、区)每年都要添置一批新的,檢修一批旧的,同时报廢一批。但是,对于应添置多少,送厂檢修多少,維修费用多少等問題,过去在制訂年度計划时,往往心中无数或依据不足,因此,全面掌握流速仪的 The current meter is the main instrument in the hydrological test work. Each province (city, district) must purchase a batch of new ones each year and repair a batch of old ones and scrap them at the same time. However, problems such as how much should be procured, how much maintenance should be sent to the factory, and how much the maintenance costs are incurred are often numerous or inadequate in the formulation of the annual plan. Therefore,