客户关系管理系统是一套人——机交互系统，需要一个有效的CRM解决方案的支撑。
查看答案
什么是铁路专用线的有效长度？如何确定专用线的有效长度和专用线的技术等级？
利用推车机将矿车推入罐笼后，把钩工一定要将头探入罐笼内观察矿车停放情况。
A. 正确
B. 错误
Why would you use the following FLASHBACK TABLE command？（） FLASHBACK TABLE emp TO TIMESTAMP （’11：45’，’hh12：mi’）;
A. to undo the changes made to the EMP table since the specified time
B. to restore the EMP table that was wrongly dropped from the database
C. to view the transactions that have modified the EMP table since the specified time
D. to view the changes made to the EMP table for one or more rows since the specified time
E. to recover the EMP table to a point in time in the past by restoring the most recent backu
（）是社会主义道德建设的基本任务。
A. 以德治国
B. 弘扬中华传统美德
C. 全面提高公民道德素质
微信支付 
支付宝支付