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问题 单项选择题

门捷列夫在1871年的《化学元素的周期性依赖关系》中发表了第二个化学元素周期表，明确指出：元素的性质和它们的化合物的性质与元素的原子量有周期性的依赖关系，元素的性质是元素原子量的( )。

A．线性函数
B．非线性函数
C．周期函数
D．非线性函数

答案

参考答案：C

单项选择题

Why is (71) 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 hid 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 (72) nature of the task．In one Way or another the problem id ever new, and its solver learns something：sometimes (73) ，sometimes theoretical，and sometimes both．Finally there is the delight of Working in such a tractable medium．The (74) ，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 (75) ，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．

（73）处填（）。

A．semantic

B．practical

C．lexical

D．syntactical
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选择题

如列所示的图案分别是奔驰、奥迪、大众、三菱汽车的车标，其中，可以看作由“基本图案”经过平移得到的是[ ]

A．

B．

C．

D．
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