（）类型的字段用于存储固定长度的字符串。

通常计算机的内存可采用（）

未知题型通常计算机的内存可采用（）

关于协议，下述正确的是（）。

未知题型关于协议，下述正确的是（）。

Which of the following statements about ren are true? A...

多项选择题Which of the following statements about ren are true?
A、Ren is at the core of Confucius teachings.
B、Ren is a concept that is easy to define precisely.
C、Ren is a deep concern for the welfare of others.
D、Ren is the highest moral principle.