Which of the following statements is NOT true according to the passage

A．The term "averted vision" refers to the act of looking out of the corners of one’s eyes.

B．If you want to see very faint things, you should better look sideways rather than straight on.

C．The receptors located in the eye’s center are less sensitive to dim light.

D．To "look" is to see something straight ahead.

数字通信的主要特点是 (19) ，模拟信号数字化最基本的方法有三个过程，其正确的顺序是 (20) 。

A．采样、量化、编码

B．量化、采样、编码

C．编码、量化、采样

D．采样、编码、量化