Your company has a main office and a branch office. The company has a single-domain Active Directory forest. The main office has two domain controllers named DC1 and DC2 that run Windows Server 2008 R2. The branch office has a Windows Server 2008 R2 read-only domain controller （RODC） named DC3. All domain controllers hold the DNS Server server role and are configured as Active Directory-integrated zones. The DNS zones only allow secure updates. You need to enable dynamic DNS updates on DC3. What should you do（）
A. Run the Ntdsutil.exe DS Behavior commands on DC3.
B. Run the Dnscmd.exe /ZoneResetType command on DC3.
C. Reinstall Active Directory Domain Services on DC3 as a writable domain controller.
D. Create a custom application directory partition on DC1. Configure the partition to store Active Directory-integrated zones.
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土质路堑混合挖掘法是指（）混合使用.
A. 多层横向全宽挖掘法和分层纵挖法
B. 单层横向全宽挖掘法和分层纵挖法
C. 多层横向全宽挖掘法和通道纵挖法
D. 单层横向全宽挖掘法和分段纵挖法
对于原地基处理，下面哪个说法不正确（）.
A. 路基用地范围内的树木、灌木丛等均应在施工前砍伐或移植清理
B. 原地面的坑、洞、墓穴等应用原地土或砂性土回填
C. 当路堤填土高度小于路床厚度（80cm）时，路床压实度不宜小于基底压实度标准
D. 路堤原地基横坡陡于1：5时，原地基应挖成台阶
《注册建造师执业管理办法（施行）》规定，机电工程中，冶炼专业工程范围包括烧结球团工程、焦化工程、冶金工程、煤气工程、建材工程、（）工程.
A. 动力站安装
B. 起重设备安装
C. 工业炉窑安装
D. 制氧
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