温 * * * * 在国务院第二次廉政工作会议上的讲话强调，今年政府工作任务重、头绪多，要注重推进管理创新，提高办事效率和工作透明度，加强对权力的制约和监督，保证行 * * 力规范运行和正确行使。尤其要防止利用扩大公共投资的机会为本部门、本单位和个人谋取私利。
（1）为什么要完善对权力的监督约束机制？
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（2）如何完善对权力的监督约束机制？
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