儿童成就性动机主要激发的是（） ["运动性游戏","智力游戏","合作性游戏","象征性游戏"]
Your end user customer has not requested a ServicePac to cover the base unit and options they have purchased. What is a compelling reason to offer service？ （） ["IBM ServicePacs remove a liability from you the reseller in the event of fire","IBM ServicePacs remove a liability from you the reseller in the event of flooding","IBM ServicePacs provide improved warranty coverage","Service just adds a layer of cost you do not need","all of the above"]
当受力超过一定的限度时自动打滑的离合器是（） ["侧齿式离合器","内齿离合器","摩擦离合器","柱销式离合器"]
江垭工程合同工程量与实际工程量有较大的出入，加之主体工程建设工期长达5年，不利因素多，因此（）是进行投资控制工作的重点之一 ["计量控制","预算控制","工期控制","计划控制"]
You created a view called EMP_DEPT_VU that contains three columns from the EMPLOYEES and DEPARTMENTS tables: EMPLOYEE_ID, EMPLOYEE_NAME AND DEPARTMENT_NAME. The DEPARTMENT_ID column of the EMPLOYEES table is the foreign key to the primary key DEPARTMENT_ID column of the DEPARTMENTS table. You want to modify the view by adding a fourth column, MANAGER_ID of NUMBER data type from the EMPLOYEES tables. How can you accomplish this task? （） [" ALTER VIEW EMP_dept_vu (ADD manger_id NUMBER);"," MODIFY VIEW EMP_dept_vu (ADD manger_id NUMBER);"," ALTER VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employee e, departments d WHERE e.department _ id = d.department_id;"," MODIFY VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department _ id = d.department_id;"," CREATE OR REPLACE VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department _ id = d.department_id;"," You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view."]
三相功率因数表用于测量（）的功率因数。
