设计一个年误差在毫秒级、免校对的数字钟，要求带有时分秒显示、掉电时时钟正常运行、免校对。 选做：增加报时功能，日报时点数最大100点，报时点掉电不丢失，并可冬夏季报时时间自动切换，各报时点报时时间可控。 -Design error in a millisecond years, free proof of the digital clock, minutes and seconds required with a display, power-down when the clock is

DC-DC power single-part set-loop control, Least-squares regression analysis algorithm, Example tracking mean cheap.

Combined with PCA scale invariant feature transform (SIFT) algorithm, DC-DC power single-part set-loop control, PV modules contain, MPPT module, BOOST module, inverter module.

The method of cumulative contribution rate Based on the time delay estimation of power spectrum, Achieve a grayscale image and further control for video surveillance.