传统需求层次理论把人分成几层？
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“输入掩码”属性用于设定控件的输入格式，其中仅可以对文本型和______数据进行输入掩码向导的设置。
A healthy diet along with exercise will help you look better, feel better and live longer. But I am 1 to say that many children don’t have a healthy lifestyle. They eat much junk（垃圾）food 2 French fries and fried chicken. Eating too much junk food and dessert is 3 .If you want to 4 a long and healthy life, you have to 5 your living habits（习惯）. It is important to get a yearly physical examination（体检）,too. You don’t hope to 6 any bad news, but the doctor will tell you _7 healthy you are. It’s also a good idea for you to 8 a book on healthy eating. 9 milk or juice from fruits and vegetables can help to improve your health, too. I am 10 good health now. People tell me that I look very young. Healthy eating has helped me and it will also help you! 小题1:.
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在数据库管理系统的层次结构中，由高级到低级的层次排列顺序为
A．应用层，数据存取层，数据存储层，语言翻译处理层
B．应用层，数据存储层，数据存取层，语言翻译处理层
C．应用层，数据存储层，语言翻译处理层，数据存取层
D．应用层，语言翻译处理层，数据存取层，数据存储层
工程建设监理的（）是由其任务所决定的。
A.独立性
B.公正性
C.科学性
D.服务性
在电气化区段接触网电分相前方，分别设断电标、禁止双弓标。对于最高运行速度大于120km/h的旅客列车、特快货物列车及最高运行速度为120km/h的货物列车、快速货物班列运行的线路，在断电标的前方增设特殊断电标。在接触网电分相后方（）m设合电标。
A、30
B、45
C、75