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搜题
【简答题】
Watch a short video made in 2010 on urban migration(迁徙)in China and fill in theblanks below. 1 From 1990 to 2010, more than people in China moved from rural areas into cities. Average yearly growth (of urban migration). Annual (urban) population increase: , 470 million; , 560 million; , 675 million; , 950 million. children born each day (in urban areas). Urban population will by 2030.
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举一反三
【单选题】分析运放的两个依据是( )。
A.
U- ≈ U+ ； I- ≈ I+ ≈ 0
B.
I- ≈ I+ ≈ 0 ； Au=1
C.
U 0 =Ui ； Au=1
D.
Au=1 ； U- ≈ U+