题目内容：
用8位二进制数能表示的最大的无符号整数等于十进制整数（ ）。
A．255 B．256
C．128
D．127
参考答案：
答案解析：
单选题：用8位二进制数能表示的最大的无符号整数等于十进制整数（ ）。
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B．256
C．128
D．127
B．256
C．128
D．127
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