RBD的概念及类型
平版印刷为什么要先给印版供水，再给印版供墨才能正常印刷？
车、钻床作业时，操作者应穿紧身衣裤，袖口扣好，禁止戴（） ["眼镜","手套","帽子","口罩"]
对一个信息系统的性能进行估计、检查、测试、分析和评审的过程称为（） ["系统维护","系统分析","系统评价","系统审计"]
Although Wales has been united with England for more than 400 years,the Welsh has kept alive（）. ["their own language","their own literature","their own tradition","All of the above"]
简述我国土地资源开发利用中存在的问题及合理利用的途径。
