已知1=12,1+3=22,1+3+5=32,1+3+5+7=42,1+3+5+7+9=52,…根据前面各式的规律可猜测:1+3+5+7+…+(2n﹣1)=( )
n2
He jumped at the opportunity when he saw the advertisement in a newspaper,because barely ________ make ends meet.
A.he could
B.could he
C.he couldn't
D.couldn't he
通常所说的建设项目竣工验收,是指( )验收。
A.工程整体
B.单项工程
C.单位工程
D.分部工程