农业品牌化是衡量农业现代化发展水平的决定因素之一。作为一个世界农业大国,我国许多农产品产量居全球第一,但缺少一批像荷兰花卉、马铃薯等在国际市场上具有竞争力的农产品品牌和农业公司,导致我国众多优势农产品无法产生高的产品附加值,占据高端消费市场。 荷兰国土面积狭小,人口密度居欧洲之首,农业资源先天贫乏。但荷兰农业农产品出口占全球的9%,农产品出口额高居世界前列。这些都与近几十年来,荷兰一直根据国际市
本文提出一种基于VFC(电压—频率变换器)进行模数转换的新型多功能数据采集系统。其优点是:兼有模拟量输入通道的隔离功能;在百余米距离外,仍可准确地传送信号;用户可按要求
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