题目内容

下列关于极限的概念说法不正确的是

A. 极限存在的话，一定是常数
B. 极限是一种无限逼近的状态
C. 一个函数的极限可以有两个或两个以上
D. 极限研究的在自变量的某种变化趋势之下，函数值的变化趋势

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截锤问题中，随着时间的推移，剩余杆子的长度极限存在，就是0

A. 对
B. 错

The first known use ofself-plagiarismwas in 1833.Merriam-Webster defines it as "the reuse of one's own words, ideas, or artistic expression (as in an essay) from preexisting material especially without acknowledgment of their earlier use".Borrowing your own words is a tricky issue. … Writers and publishers tend to rankself-plagiarismas a lesser offense than—what should we call it?—"real" plagiarism? Still, they mostly agree it's a no-no. — Taylor WoffordQuestions.How do you define self-plagiarism? How to properly use one's own previous works in an academic paper?

包装应具备（）方面的功能。

A. 包装的保护性
B. 包装的促销性
C. 包装的便利性
D. 包装的环保性

使用后的包装应该再利用回收，这就需要包装具有环保性功能。

A. 对
B. 错