灯泡L1和L2串联在电路中,加在它们两端的总电压为12V,L1电阻是8Ω,L2两端的电压是4V,则L1中的电流是____A。
1
— Which is ______ season in Beijing?
— I think it's autumn. [ ]
A. good
B. better
C. best
D. the best
为应对美国的核讹诈,中国集中全力发展了核工业和航天工业,()年开始了核潜艇的研制工作。
A.1959
B.1960
C.1964
D.1958