The geography of disease and ill health analyses the ______with which certain diseases appear in different parts of the world, and ______the data with the geography of the region, to see if there could be a ______between the two.
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【单选题】在下图所示电路中,基本回路已选定为自然网孔。电流控制电压源 U cs=50 I ,电压控制电流源 I cs=1.5 U ’ 。若只求三个回路电流,则列写的原始方程最少为多少个?