[单选] 硅酸盐水泥42.5和42.5R（）。

选择酶反应器的主要依据有哪些？ Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). All client computers run Windows XP Professional Service Pack 3 (SP3). You assign NTFS permissions to a folder on a file server as shown in the following table. You share the folder and assign the Change permission to the Everyone group. A user named User1 is a member of Group1, Group2, and Group3. You need to identify the least restrictive NTFS permission that User1 has when he accesses the folder over the network. Which permission should you identify?（） Full Control。 Modify。 Read。 Write。 带电换表时，若接有电压、电流互感器，则应分别（）。 开路、短路。 短路、开路。 均开路。 均短路。 试述烧死与死后焚尸的鉴别要点？ 简述滤镜的主要作用。   硅酸盐水泥42.5和42.5R（）。