#农科学子上头条# 国内北方地区受到自然气候条件的影响，冬天很难露天生产。如北京地区只有半年多时间可以进行露天生产，东北地区全年无霜期仅有120 d左右，个别地方甚至更少。在这些地区，发展人工温室、塑料大棚和 ...
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