干旱的防御措施主要有兴修水利；搞好农田基本建设；选用抗旱品种、采用（）措施；推广旱作节水农业等。 ["防旱","耐旱","抗旱保墒","抗干热风"]
交互式调和工具不能用于应用了（）的物体 ["透镜","群组","立体化","交互式阴影"]
内部成本核算的目的为（）。
光照说
Which of the following is an OSPF configuration parameter that is used on an ABR, but not on an internal router？（） [" A virtual link to area 0."," OSPF summarization command."," default - cost extension to the area command."," no - summary extension to the area stub comm and."," None of the other alternatives apply"]
DHCP服务器工作过程
