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单项选择题

某反应釜液位变化范围为0~1.6m，仪表为8位单片机且采用ADC0809进行AD转换，在某一时刻计算机采样并经数字滤波后的数字量为0x4EH，则对应的液位值是（ ）米。 A. 0.5 B. 0.498 C. 0.489 D. 0.475

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单项选择题
In the ____, democratization tide of the outside world, the Qing Dynasty still adopted the conservative politics and economic restraining practice of Ming Dynasty, cutting off the contact and communication with other countries. These backward ruling ideas and many ways of governing the country reversed the history, and dragged China, which was advancing to capital society once, back into the backward social stage.
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