【導(dǎo)讀】選題的目的和意義········································································1. 國外對小麥播種機(jī)的研究································································1. 國內(nèi)對小麥精密播種機(jī)的研究現(xiàn)狀················································2. 第二章整機(jī)總體方案設(shè)計(jì)·········································································3