Which three statements correctly describe the functions and use of constraints? （）
A. Constraints provide data independence.
B. Constraints make complex queries easy.
Constraints enforce rules at the view level.
D. Constraints enforce rules at the table level.
E. Constraints prevent the deletion of a table if there are dependencies.
F. Constraints prevent the deletion of an index if there are dependencies.
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普米克都宝的成分为()可作为COPD患者长期吸入的药物为()可快速扩张支气管的药物是()
A. 沙丁胺醇
B. 沐舒坦
C. 异丙托溴胺
D. 布地奈德
E. 二丙酸倍氯米松
服务人员个人卫生应做到的“四勤”有：勤剪指甲、勤理 发、勤洗澡、勤换工作服。
A. 正确
B. 错误
An application vendor wants to choose a fault tolerant platform for their new application. The application benefits from multiple processors and has been tested on Red Hat Advanced Server 3. To determine the memory requirements for the application， which of the following is the best procedure？（）
A. The application should be tested and baselines should be measured with simulated user loads.
B. The application should be tested with the minimum amount of memory then increase the memory in increments until an acceptable response is achieved.
C. The application should be tested with differing amounts of memory and the fastest response time is reached it should be used as the acceptable configuration.
D. The application should be tested with the maximum amount of memory then decrease the memory in increments until an acceptable price/performance ratio is reached.
教师选择给幼儿的学习内容，应有一定的难度，而且是逐渐加深的，需要幼儿作出一定的努力才能学会。这体现了幼儿园教育活动的（）。
A. 活动性原则
B. 发展性原则
C. 直观性原则
D. 个别对待原则
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