无公害农产品属中国普通农产品合格或较好的质量水平。()
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通过铺设草方格,埋设防沙障等方式可以防止沙漠进一步扩展。()
A. 对
B. 错
海湾战争后GPS技术民用化,为处方农业提供定位手段。
A. 对
B. 错
测土配方施肥技术的核心是调节和解决作物需肥与土壤供肥之间的矛盾。
A. 对
B. 错
The three men tried many times to sneak across the border inthe the neighboring coutry_________ by the police each time.
A. had been captured
B. being always captured
C. only to be captured
D. unfortunately captured