单选题

ASCII is a 7-bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which are (75) .
【正确答案】 B
【答案解析】[解析] ASCII是一种7比特编码，它用来表示数字、字符和特殊的打印符号。它也包含控制字符的编码，这些编码不能够打印或者显示。