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练习6-3：分析顺序控制编程方法的优点和缺点？

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练习7-1：（1）西门子工业网络由哪些类型构成？（2）什么是PROFIBUS？（3）什么是PROFINET？（4）两者区别是什么，至少回答3点区别？

In Leaves of Grass, _________ is all that concerned Whitman.

A. individualism
B. freedom
C. the spirit of democracy
D. all the above

We can perhaps summarize that Walt Whitman's poems are characterized by all the following features EXCEPT they are ________.

A. conversational and casual
B. lyrical and well-structured
C. simple and rather crude
D. free-flowing

Walt Whitman was a founding figure of American poetry. His innovation first of all lies in his use of __________.

A. blank verse
B. heroic couplet
C. free verse
D. iambic pentameter