题目内容：
在标准ASCII码表中，英文字母a和A的码值之差的十进制值是（ ）。
A．20 B．32
C．-20
D．-32
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
单选题：在标准ASCII码表中，英文字母a和A的码值之差的十进制值是（ ）。
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B．32
C．-20
D．-32
B．32
C．-20
D．-32
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