砌筑墙体中，可以不设置过梁的洞El最大宽度为（）。 ["250mm","300mm","400mm","500mm"]
Company.com has a resource group that contains a database that is accessed by a web client based on another system. The communication to the database is TCP/IP. Occasionally after a failure， the end users get unusual error messages that indicate the database server is not available. It has been determined that the web server is trying to access the database server’s information before it has completed file system recovery after a failure. How can HACMP affect this problem？（） [" HACMP can resequence the order to the starting of the various resource group elements by utilizing Dynamic Node Priority."," The order of dependency can be controlled though the HACMP resource group configuration if the web server was made to be part of the HACMP cluster."," HACMP can delay making the network label available until after the filesystem checks have completed with the "filesystem mounted before IP is configured"."," The IP service label can be in a second resource group allowing the sequential processing of resource groups to control when the IP service label is made available."]
《测绘法》确定的基本制度可以划分为（） ["测绘管理体制","测绘活动主体资质资格与权利保障制度","测绘项目与测绘市场制度","测绘基准制度","测绘成果保密技术处理制度"]
lisa is writing a formula to determine the number of elements in a list. she wants to ensure that a value is returned, even if the value her function is evaluating turns out to be a null string . which one of the following can she so to accomplish this ?（） ["use a defaule formula of 1 ","use @elements and add 1 to the total ","use the @count function instead of @elements ","use @texttotime to ensure that all strings arte converted to date-time values&e"]
气瓶充装标签必须逐瓶粘贴。未逐瓶粘贴的，责令改正，处（）罚款，情节严重的，暂停充装，直至吊销其充装许可证。 ["1万元以上3万元以下","5千以上1万以下","1万元以上","3万元以下"]
请描述机组的三种停机方式
