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()是从树叶落尽或完全变色至树液流动,芽开始膨大为止的时期。...
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温带地区树木的生物学零度一般日平均温度为()℃A、5B、8C、10D、18...
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修剪的程序是“一()、二()、三()、四()、五()。”...
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()是指点上下两根主枝方位相同而且相距近,上枝遮光,仰止下枝。...
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根据影响种子寿命的内在因素,保持种子寿命的措施有哪些?...
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一般树木适合施基肥、移植、整形修剪时期是()。A、生长盛期B、休眠期C、生长初期D、生长末期...
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Monday, May 29, 2023
小气候的形成缘于局部地理条件的影响,大的如()、小的如()。...
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什么叫作物的生长?什么叫作物的发育?分别举例说明。并简单分析生长...
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