搜题请搜索小程序“爱下问搜题”
问题 单项选择题

制定运动处方时要依据处力对象的不向年龄、性别、体质、健康状况等因素科学编制处方项目，使人能得到全面协调的发展，从而更好地增强休质，预防运动损伤的发生。这就是运动处方的（）

A、渐进性原则

B、合理性原则

C、负荷性原则

答案

参考答案：B

单项选择题

在关系运算中，投影运算的含义是______。

A．在基本表中选择满足条件的记录组成一个新的关系

B．在基本表中选择需要的字段(属性) 组成一个新的关系

C．在基本表中选择满足条件的记录和属性组成一个新的关系

D．上述说法均是正确的
查看答案
单项选择题

Why is ______ fun. What delights may its practitioner expect as his reward. First is the sheer joy of making things. As the child delights in his mud pie, so the adult enjoys building things, especially things of his own design. Second is the pleasure of making things that are useful to other people. Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle cycles, playing out the consequences of principles built in from the beginning. Fourth is the joy of always learning, which springs from the ______ nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes ______, sometimes theoretical, and sometimes both. Finally, there is the delight of working in such attractable medium. The ______, like the poet, works only slightly removed from pure thought-stuff. Few media of creation are so flexible, so easy to polish and rework, so readily capable of realizing grand conceptual structures.
Yet the program ______, unlike the poet’s words, is real in the sense that it moves and works, producing visible outputs separate from the construct itself．It prints results, draws pictures, produces sounds, moves arms．Programming then is fun because it gratifies creative longings built deep within us and delights sensibilities we have in common with all men．

A．programming
B．composing
C．working
D．writing
查看答案