This proof following enterprise already through the authentication , and has set up a file in the dongguan 114 nets industry and commerce enterprise database , inquires the more detailed enterprise material , please dial the dongguan enterprise information desk 96060 ( artificially ) 9686810114 billion ( to be automatic ) , this enterprise numbers for 756 兹证明东莞市大厚湖农业开发公司已通过认证，并已在东莞114网工商企业数据库中备案，查询更详细的企业资料，请拨东莞企业查询台96060 （人工） 9686810114 （自动） ，该企业编号为756 。
Period , qin and han dynisties ( 221 b . c . - 220 ) period , three kingdoms and jin dynasty ( 220 - 420 ) period , sui and tang dynasties ( 581 - 907 ) period , song and yuan dynasties ( 960 - 1368 ) period , and ming and qing dynasties ( 1368 - 1911 ) period ; the agricultural exploitation progressions were made step by step , and were going upward from the basin to the hill and mountain areas with comprehensive , vertical and cash crops system emphasized in different stages 第六章宋元时期陕南农业的全面发展宋元时期，作为农业开发的基础一人口出现了较快的增长，为农业发展提供了丰富的劳动力。同时，由于陕南地处战略形胜之地，宋王朝在此进行了大规模的屯田。增修水利工程，倡行稻麦两熟制，发展梯田农业，重视农业的多种经营成为宋元时期陕南农业开发的主体。
The paper is written for the issues of heilongjiang provincial agricultural exploitation construction . it emphasizes the analysis on the basic situation of heilongjiang provincial agricultural exploitation construction , the problems and causes ; and also the measures and strategies of heilongjiang provincial agricultural exploitation engineering construction 侧重分析了黑龙江省农业开发及工程建设的基本情况，黑龙江省农业开发工程建设的特点，黑龙江省农业开发工程建设存在的问题及原因，黑龙江省农业开发工程建设的对策及措施。
