单项选择题

色光混合：2R+G+B是什么颜色？
A、淡黄色
B、淡蓝色
C、淡红色
D、淡绿色

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Shadow play first appeared during the Western Han Dynasty.

A．more than 1,000 years ago
B．more than 2,000 years ago
C．more than 3,000 years ago
D．more than 4,000 years ago

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使用下面哪个命令可以在虚拟终端vty上设置访问控制列表( )
A、access-group 1 in
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