如图3，点A在双曲线上，且OA＝4，过A作AC⊥轴，垂足为C，OA的垂直平分线交OC于B，则△ABC的周长为( )
There are _____on the second floor. A.four bedroomsB.two room C. a study
______my house. A.Here B.Here’sC. This
_____ is it ?——It’s 4:45. A.WhatB.WhenC.What time
There ___ . A.is heB.he isC.he are
My mum is _____ eggs in the kitchen. A.cookB.makingC.cooking
上，且OA＝4，过A作AC⊥
轴，垂足为C，OA的垂直平分线交OC于B，则△ABC的周长为( )
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