单选题:为了用键盘打开开菜单和执行菜单的命令,第一步应该按的键是(  )

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  • 题目类型:单选题
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题目内容:
为了用键盘打开开菜单和执行菜单的命令,第一步应该按的键是(  ) A.功能键F10或Alt
B.shift+功能键F4
C.Ctrl或功能键F8
D.Ctrl+Alt

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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

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