某厂生产甲产品，产品单价为10元/件，单位产品变动生产成本为4元，固定性制造费用总额为24000元，销售及管理费用为6000元，全部是固定性的，存货按先进先出发计价，最近三年的产销量资料如下表：
分别按两种方法计算期末存货成本；
在编辑Word文档时，可以按（）键删除插入点左边（前边）的字符。
Your company has a main office and one branch office. All servers run Windows Server 2003 Service Pack 2 (SP2). The main office has a third-party gateway device named Gateway1. Gateway1 is connected to the internal network and the Internet. Gateway1 supports IPSec. In thebranch office, you have a server named Server1. You create an IPSec policy on Server1. You need to ensure that Server1 can establish an IPSec tunnel to Gateway1. What should you use to configure the IPSec policy?（） ["an IP filter that allows only Internet Control Message Protocol （ICMP） traffic.","an IP filter that allows only TCP traffic on port 1701.","a pre-shared key for authentication.","Kerberos authentication."]
补丁管理具有什么的特点。
起重操作“十不吊”的规定，下列表述正确的有（） ["重物上站人或浮置物不吊","工作场地昏暗不吊","体积大的物体不吊","工件埋在地下不吊"]
说明主板芯片组北桥芯片和南桥芯片的作用。
