Combined with the problems during the experiment, design a improved testing circuit of Direct Current Attenuation Method.

结合试验过程中遇到的问题，给出了改进的直流衰减法测试电路。

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In fact, the rectified circuit with filter condenser in the direct current side is also the serious pollution source of the harmonics.

而实际上，直流侧含滤波电容的整流电路也是污染严重的谐波源。

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It is common for the direct current circuit to be interfered by alternating current voltage.

直流回路受到交流电压干扰，是控制回路中容易产生的现象。

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The direct legal precedent was set in 2004 in the Fifth Circuit case of United States v.

FORBES: Lay Cheats Justice

The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

FORBES: SEC Wants Real Time Trading Data

But analysts noted that Best Buy has passed a period of easy market share growth that came after last year's collapse of archrival Circuit City, and may have misfired this holiday season by deciding not to compete more aggressively against its new direct competitors such as Wal-Mart and Amazon in favor of preserving profits.

WSJ: Best Buy's Profit, Sales Retreat