农机具试验时,必然要在同类机具之间或用标准样机进行对比。为此需要测定机具的各种指标,其数目随机具类型和鉴定的种类不同而异。譬如每台蔬菜精量播种机的农业技术鉴定包含21项指标、经济 Agricultural machinery test, the inevitable to be between the same type of machine or with a standard prototype for comparison. To do this, a variety of indicators of the implement need to be determined, the number of which varies with the type of implement and the type of appraisal. For example, each vegetable precision seeder agricultural technical appraisal contains 21 indicators, economy