下列合法的变量名是（） ["na+e ","e-3r ","r_3 ","5we"]
污水处理采用的四级处理工艺包括哪些？
简述客户关系管理战略类型。
二叉树的第（）层上至多有2i-1（i≥1）个结点。
Your company uses Microsoft Windows Server Update Services （WSUS） to deploy software updates and service packs. Microsoft releases a security update for Windows 7. You have the following requirements： The security update must be deployed by 5：00 P.M. on Friday. Computers that are off when the security update is deployed must install the security update as soon as they are turned on. You need to manage the software update process to meet the requirements. What should you do？（） [" Approve the security update for installation through the WSUS console with a deadline of Friday at 5：00 P.M."," Approve the security update for installation through the WSUS console with no deadline."," Approve the security update for download through the WSUS console with a deadline of Friday at 5：00 P.M."," Approve the security update for download through the WSUS console with no deadline."]
善与恶的定义。
