题目内容

乌尔观象台又称月神庙,是可考的世界上最早的观象台,气势恢宏,台体共分()层。

A. 二
B. 三
C. 四
D. 五

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当轴上零件承受较大的轴向力时,可采用弹性挡圈来进行轴向固定。

A. 正确
B. 错误

已知某管道的正常流量为300m3/h,管道直径为0.25m,则管道中流体的正常流速为()m/s。

A. 0.42
B. 1.70
C. 5.34
D. 10.20

氧气是对人类活动影响较大的溶存气体之一,它是导致水中金属腐蚀的最重要原因之一

A. 正确
B. 错误

The HR user creates a stand-alone procedure as follows and grants the EXECUTE privilege on theprocedure to many database users: CREATE OR REPLACE PROCEDURE create_dept ( v_deptno NUMBER, v_dname VARCHAR2, v_mgr NUMBER, v_loc NUMBER) BEGIN INSERT INTO hr.departments VALUES (v_deptno, v_dname, v_mgr, v_loc); END; The users having permission to execute the procedure are able to insert records into the DEPARTMENTStable even though they do not have the INSERT privilege on the table. You want only those users whohave privileges on the DEPARTMENTS table to be able to execute the procedure successfully. What would you suggest to the PL/SQL developers to achieve this()

A. Create the procedure with definer’s right.
B. Create the procedure with invoker’s right.
C. Grant the EXECUTE privilege with GRANT OPTION on the procedure to selected users.
D. Create the procedure as part of a PL/SQL package and grant the EXECUTE privilege on the package to selected user

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