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设计旅行社的结构需要遵循哪些的原则？

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阻值相同的两个电阻在并联和串联其阻值（）

A. 相等
B. 并联时大
C. 串联时大

What should an administrator do to set up a required role for a user id that will allow it to start/stop WPARs on the server？（）

A. On the desired WPAR：mkrole authorizations=aix.wpar.system newRole setkst -t role chuser roles=newRole default_roles=newRole user1
B. On the global environment：mkrole authorizations=aix.wpar.system newRole setkst -t role chuser roles=newRole default_roles=newRole user1
C. On the desired WPAR：Edit the /etc/security/authorizations file adding：‘newRole authorizations=aix.wpar.system’setkst -t role chuser roles=newRole default_roles=newRole user1
D. On the global environment：Edit the /etc/security/authorizations file adding：‘newRole authorizations=aix.wpar.system’setkst -t role chuser roles=newRole default_roles=newRole user1

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Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements insert a row into the table? （）

A. INSERT INTO employees VALUES (NULL, 'John', 'smith');
B. INSERT INTO employees (first_name, last_name) VALUES ('John', 'smith');
C. INSERT INTO employees VALUES ('1000, 'John', 'smith');
D. INSERT INTO employees (first_name, last_name, employee_id) VALUES (1000, 'John', 'smith');
E. INSERT INTO employees (employee_id) VALUES (1000);
F. INSERT INTO employees ( employee_id, first_name, last_name, ) VALUES (1000, 'John','')

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社区的主要功能有哪些？

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