BCD码由四位二进制数构成，格雷码只是其中表示十进制数的一种有权码。
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数字和字符可以编码，但标点符号是无法编码的
A. 对
B. 错
What does Bradley Cohen decide to do in the next interview?
A. He will talk about the Tourette's stuff indirectly.
B. He will talk about the Tourette's stuff frankly.
What does Bradley Cohen do in his class?
A. He allows his students to speak out.
B. He makes lots of requirements to his students.
How does Ron feel after hearing about Bradley Cohen's interview?
A. He is surprise after hearing about Bradley Cohen's stuff.
B. It brings more pressure to him.
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