建筑石膏的技术性质有（）。 ["凝结硬化快","硬化时体积微膨胀","硬化后孔隙率高","防火性能好","耐水性和抗冻性好"]
our network contains a DNS server that has a reverse lookup zone for all of your network segments. You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). An IP security policy is assigned to Server1.You verify IPSec traffic and see that the current security associations display only by IP address. You need to view the fully qualified domain names for all security associations. What should you do?（） ["From the DNS console, add Server1 as a name server. ","From the DNS console, change dynamic updates to Secure only. ","From IP Security Monitor on Server1, enable DNS name resolution. ","From IP Security Monitor on Server1, create a new taskpad view."]
MD5的分组处理是由4轮构成的，每一轮处理过程类似，只是使用的（）不同，而每轮又由16个步函数组成，每个步函数相投，但为了消除输入数据的规律性而选用的（）不同。
空头套期保值
口索是（）动物的结构。 ["A.哺乳动物 ","B.爬行动物 ","C.脊索动物 ","D.半索动物"]
孪生方向
