[多选] 信用证的特点包括（）。

Your network contains a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 is configured as shown in the following table. Disk2 fails. You remove Disk2 from the computer and replace it with a new disk. You open the Disk Management snap-in and discover that the status of a disk is Missing. You initialize the new disk and convert it to a dynamic disk. You need to configure Server1 to meet the following requirements: ·Prevent the loss of data on drive E. ·Allow the new disk to be added to the mirror of drive E. ·Allow the missing disk to be removed from the Disk Management snap-in. What should you do? （） Break the mirror.。 Remove the mirror.。 Remove the volume.。 Create a simple volume.。 证券公司的主要业务包括（） 承销业务。 经纪业务。 存贷款业务。 自营业务。 中碳钢 要从突变基因文库中筛选得到人们所需的正突变基因，筛选工作量很大，必需采用各种（）。 总价合同分为固定总价合同和（）合同。 信用证的特点包括（）。