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
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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
通知和通报都可以用于传达情况和告知事项,但通知传达的是重要情况,告知的是特殊情况;而通报传达的是上级指示,告知的往往是一般事项。
A. 正确
B. 错误
客户购买理财产品时需接受风险承受力测评。
A. 正确
B. 错误