A
The first Olympic mascot(吉祥物)
20th
1972
Munich(慕尼黑)
Germany
23rd
1984
Los Angeles
America
26th
1996
Atlanta
(亚特兰大)
27th
2000
Sydney
Australia
29th
2008
Beijing
China
?
2012
London
England
旺____、____ 轻____、____
浑____、____ 谁____、____
电阻R1两端的电压是2V,求: