The first selected element selects two voltage references from the first group of voltage references according to m most significant bits of the N-bit digital signal.

第一选择单元依据N位数字信号的M个最高位，由第一组参考电压中选择出两参考电压。

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Co-founder Neeru Khosla says the nonprofit group had been developing digital science and math books for about two years.

VOA: special.2009.08.27