[问答题] 简述突变基因定向选择的基本过程。

Photoshop 中，关于“图像>调整>去色”命令的使用，下列描述哪些是正确的？ （） ["使用此命令可以在不转换色彩模式的前提下，将彩色图像变成灰阶图像，并保留原来像素的亮度不变","如果当前图像是一个多图层的图像，此命令只对当前选中的图层有效","如果当前图像是一个多图层的图像，此命令会对所有的图层有效","此命令只对像素图层有效，对文字图层无效，对使用图层样式产生的颜色也无效"] 灰口铸铁有什么特点？ You create a Web Form. The Web Form uses the FormView control to enable a user to edit a record in the database. When the user clicks the Update button on the FormView control, the application must validate that the user has entered data in all of the fields. You need to ensure that the Web Form does not update if the user has not entered data in all of the fields. Which code segment should you use？（） ["","","",""] 从总体上阐述事故的应急方针、政策、应急组织结构及相关应急职责，应急行动、措施和保障等基本要求和程序应急预案是（）。 ["综合应急预案","专项应急预案","现场处置方案","现场应急预案"] You are the network administrator for Wingtip Toys. The network consists of a single Active Directory domain named wingtiptoys.com. The Active Directory-integrated DNS zone named wingtiptoys.com is replicated to all domain controllers. Only domain controllers have the DNS service installed.The network management department requires all hosts in the manufacturing division to be registered in the DNS namespace manufacturing.wingtiptoys.com. The manufacturing.wingtiptoys.com namespace does not exist on any of the DNS servers.You need to add support for the manufacturing.wingtiptoys.com namespace to all the existing DNS servers. To reduce administrative overhead， you want to find a solution that will not require reconfiguration if DNS servers are added to the domain in the future.  What should you do？（） ["Create a subdomain named manufacturing in the wingtiptoys.com zone.","Create a delegation named manufacturing in the wingtiptoys.com zone.","Create a stub zone for manufacturing.wingtiptoys.com.","Create a primary zone for manufacturing.wingtiptoys.com that is not Active Directory-integrated."] 简述突变基因定向选择的基本过程。