单项选择题
无功功率的单位是( )
A、伏安(VA)
B、瓦(W)
C、乏(Var)
D、焦耳
无功功率的单位是( )
A、伏安(VA)
B、瓦(W)
C、乏(Var)
D、焦耳
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单项选择题
In which year the world's population lived in urban areas is more than 50% for the first time in history?
In which year the world's population lived in urban areas is more than 50% for the first time in history?
A.2007
B.2000
C.2010
D.2005