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选择题：简述合格苗木应具备的条件。
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千粒重主要反映种子的()。
千粒重主要反映种子的()。
Which statement is true concerning 6to4 tunneling?()
Which statement is true concerning 6to4 tunneling?()
典型的花由花萼、花冠、()、()。
典型的花由花萼、花冠、()、()。
Your Company has migrated to IPv6 in their network. Which three IPv6 notations represent the same address?()
Your Company has migrated to IPv6 in their network. Which three IPv6 notations represent the same address?()
林木结实量多的年份叫(),结实量少的年份叫()。
林木结实量多的年份叫(),结实量少的年份叫()。