某库94年1-6月份共记帐5610笔，记单31205笔，经检查发现帐面不正规涂改15笔，记单涂改21笔，请计算出上半年该库涂改率.
查看答案
View the Exhibit to observe the roles assigned to the SL_REP user. Which statement is true about theassignment of the SELECT_CATALOG_ROLE role to the SL_REP user（）
A. The user must enable the role explicitly.
B. The user can grant the role to other users.
C. The user cannot use the role until the DBA enables it explicitly.
D. The user can start using the role immediately without any change
碳素工具钢都是优质或高级优质钢，其含碳量一般大于0、7％。
A. 正确
B. 错误
微信支付 
支付宝支付