如图所示电路,已知电源的电动势E=3V,内阻r=1Ω,外电阻R=5Ω.若电键S闭合,则理想电流表 示数为____A.
gài niàn
fēi xiáng
bīn fēn
shùn jiān
xiǎo jìng
____
—When and where were you born?
—I was born ________ October 1st,1997 ________ Beijing.