论文部分内容阅读
在平时的学习中,我们经常遇到以下两类问题但又时时出错,笔者试图通过对它们的剖析,以期引起同学们的注意.
In the usual study, we often encounter the following two kinds of problems but they often make mistakes. The author tried to analyze them to attract the attention of the students.