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什么是常规能源？

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自我防御机制

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商事行为的特征是什么？

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Your company has a main office and three branch offices. The network consists of a single Active Directory domain. Each office contains an Active Directory domain controller. You need to create a DNS infrastructure for the network that meets the following requirements： èThe DNS infrastructure must allow the client computers in each office to register DNS names within their. respective offices. èThe client computers must be able to resolve names for hosts in all offices. What should you do？（）

A. Create an Active Directory-integrated zone at the main office site.
B. Create a standard primary zone at the main office site and at each branch office site.
Create a standard primary zone at the main office site. Create a secondary zone at each branch office site.
D. Create a standard primary zone at the main office site. Create an Active Directory-integrated stub zone at each branch office site.

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水稻根在土壤中的分布，拔节前根系主要在土壤深层进行纵向生长，呈倒卵圆形；拔节后根系主要在土壤表层进行横向生长，呈扁椭圆形。

A. 正确
B. 错误

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