[单选] You load an XmlDocument named doc with the following XML. You need to use an XPath query string to select the two book nodes. Which code segment should you use? （）

Contoso, Ltd. has an Active Directory domain named ad.contoso.com. Fabrikam, Inc. has an Active   Directory domain named intranet.fabrikam.com.   Fabrikams security policy prohibits the transfer of internal DNS zone data outside the Fabrikam network.   You need to ensure that the Contoso users are able to resolve names from the intranet.fabrikam.com  domain.   What should you do（）  Create a new stub zone for the intranet.fabrikam.com domain.。 Configure conditional forwarding for the intranet.fabrikam.com domain.。 Create a standard secondary zone for the intranet.fabrikam.com domain.。 Create an Active Directoryintegrated zone for the intranet.fabrikam.com domain.。 资产阶级最基本的道德规范是（）。 Your company uses DHCP to lease IPv4 addresses to computers at the main office. A WAN link connects the main office to a branch office. All computers in the branch office are configured with static IP addresses. The branch office does not use DHCP and uses a different subnet. You need to ensure that the portable computers can connect to network resources at the main office and the branch office. How should you configure each portable computer？（） Use a static IPv4 address in the range used at the branch office.。 Use an alternate configureation that contains a static IP address in the range used at the main office。 Use the address that was assigned by DHCP as a static IP address。 Use an alternate configuration that contains a static Ip address in the range used at the branch office.。 银版合约 Your application uses two threads， named threadOne and threadTwo. You need to modify the code to prevent the execution of threadOne until threadTwo completes execution. What should you do？（）  Configure threadOne to run at a lower priority.。  Configure threadTwo to run at a higher priority.。  Use a WaitCallback delegate to synchronize the threads.。  Call the Sleep method of threadOne. 。  Call the SpinLock method of threadOne.。 You load an XmlDocument named doc with the following XML. You need to use an XPath query string to select the two book nodes. Which code segment should you use? （）