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案例分析题As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating (66) , (67) , and doing (68) (I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other (69) elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment (70) , processor, and operating system) and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments. （67）处应选择（）
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案例分析题As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating (66) , (67) , and doing (68) (I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other (69) elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment (70) , processor, and operating system) and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments. （69）处应选择（）
案例分析题我们常用的数据模型类型有层次模型、网状模型、关系模型和面向对象模型四种。（）是数据库系统中最早出现的数据模型，其数据库系统的典型代表是IBM公司的IMS（Information Management Systems）数据库管理系统；而（）是使用最广的数据模型。 而（）是使用最广的数据模型。
案例分析题我们用的掌上电脑通常采用的是（），其典型特性有（）。①完成某一项或有限项功能，不是通用型的②在性能和实时性方面有严格的限制③能源、成本和可靠性通常是影响设计的重要因素，占有资源少，易于连接④系统功能可针对需求进行裁剪、调整和生成，以便满足最终产品的设计要求 其典型特性有（）。
案例分析题我们常用的数据模型类型有层次模型、网状模型、关系模型和面向对象模型四种。（）是数据库系统中最早出现的数据模型，其数据库系统的典型代表是IBM公司的IMS（Information Management Systems）数据库管理系统；而（）是使用最广的数据模型。 （）是数据库系统中最早出现的数据模型，其数据库系统的典型代表是IBM公司的IMS（Information Management Systems）数据库管理系统
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