下列哪些操作可以实现选区的羽化？（） [" 如果使用矩形选框工具，可以先在其工具选项栏中设定“羽化”数值，然后再在图像中拖拉创建选区"," 如果使用魔棒工具，可以先在其工具选项栏中设定“羽化”数值，然后在图像中单击创建选区"," 对于图像中一个已经创建好的没有羽化边缘的选区，可以先将其存储在Alpha通道中，然后对Alpha通道执行“滤镜>模糊>高斯模糊”，然后再载入选区"," 对于图像中一个已经创建好的没有羽化边缘的选区，可通过“选择>羽化”命令来实现羽化程度的数字化控制"]
根据《建设工程施工专业分包合同（示范文本）》（GF―2003―0213），关于分包人责任和义务的说法，正确的有（） ["分包人应履行并承担总包合同中与分包工程有关的承包人所有义务与责任","未经承包人许可，分包人与发包人直接发生工作联系，须承担违约责任","分包人可拒绝承包人根据分包合同发生的指令","完成合同约定的设计任务，承包人承担由此发生的费用","工程未交付承包人前，负责已完成分包工程的成品保护工作"]
专门的关系运算包括（）、（）、连接和除四种。
You are a help desk technician for your company. A portion of your company’s network is shown in the exhibit. Michael is an employee in your company’s marketing department. Michael uses a Windows XP Professional computer that is located on Subnet A. You use a Windows XP Professional computer that is located on Subnet B. The company’s firewall does not use Network Address Translation (NAT). Michael sends you a Remote Assistance invitation. In Windows Messenger, you accept the invitation, but you cannot connect to Michael’s computer. Next, you run the Ping command, which verifies connectivity to Michael’s computer. You need to establish a Remote Assistance connection with Michael’s computer. What should you do next?（） ["Ask your firewall administrator to open the TCP\/IP ports that are used by Windows Messenger.","Ask your firewall administrator to open the TCP\/IP ports that are used by Remote Desktop Services. ","Instruct Michael to create an invitation file and then e-mail the file to you as a file attachment. When you receive the e-mail, open the file attachment. ","Instruct Michael to edit the System properties for his computer and add your domain user account to the Remote Desktop Users list on the Remote tab."]
廖承志对我国新闻事业作出哪些？
生命活动的基本特征是（）和（）。
