圆口纲的主要特征是什么？
Your company has a main office and one branch office. The network consists of an Active Directory domain named contoso.com. All servers run Windows Server 2003 Service Pack 2 (SP2). In the main office, a server named DNS1 hosts the primary DNS zone for contoso.com. In the branch office, you configure a secondary DNS zone for contoso.com on a server named DNS2. You discover that the resource records are not being transferred to DNS2. You verify that the contoso.com zone on DNS2 is configured to have the correct IP address for DNS1. You need to ensure that the resource records for contoso.com are transferred to DNS2. What should you do?（） ["On DNS2, configure a stub zone for contoso.com. ","On DNS2, configure a conditional forwarder for contoso.com. ","On DNS1, configure a delegation record for DNS2.contoso.com. ","On DNS1, add the IP address for DNS2 to the contoso.com Name Servers list."]
从杂草结实角度说明杂草为什么难防除？
女性，67岁，走路滑倒后，左手掌着地，X线片显示Colles骨折。该患者典型的畸形表现是（） ["爪形手","方肩","枪刺刀","外旋","肘后三角关系失常"]
政府公债，从来都是财政政策实施的重要方式，又是中央银行执行（）的主要手段。
如图BG4-3所示电路为何种反馈电路。
