单项选择题

二进制译码器输入n位二进制数，输出（  ）。
A、2n+1
B、2n
C、2的n次幂
D、2的n加1次幂

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单项选择题
The British Empire established many private companies to administer colonies and oversea trade, the most famous one is East India Company in India.
A．对
B．错
判断题
If you are invited to dinner by a friend but you already have plans for that evening which you cannot change, you have to refuse it. The polite way to refuse it is to say “thank you”, but neither accept nor reject the invitation.
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