Do you know about the U．K.? London is the capital city. Its flag is red, white and blue.They speak English. Big Ben is very famous. Kings and queens live in palaces. I have an uncle. He lives in London.He says, "London is clean and beautiful."He is a teacher. He works from Monday to Friday.On Saturdays and Sundays, he likes to play football and go for a walk. I want to go to the U．K. Because I want to see Buckingham Palace.

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为防止酒驾事故的出现，酒精测试仪被广泛应用．有一种由酒精气体传感器制成的呼气酒精测试仪，当接触到的酒精气体浓度增加时，其电阻值降低，如图甲所示．当酒精气体的浓度为0时，R₁的电阻为60Ω．在图乙所示的工作电路中，电源电压恒为8V，定值电阻R₂=20Ω．求：

（1）当被检测者的酒精气体的浓度为0时，电压的示数是多少？

（2）现在国际公认的酒驾标准是0.2mg/mL≤酒精气体浓度≤0.8mg/mL，当电流表的示数为0.2A时，试通过计算判断被检测者是否酒驾．