单项选择题（），蒙语称“哈那”，是长短不同、粗细均匀的柳条按两层等距离交叉排列形成菱形网眼，然后在交叉点上打眼(隔一个交叉点钉一个)固定而成的网壁结构。A.围墙B.围栏C.围壁D.墙壁
不定项选择Consumer surplus is the amount a buyer is willing to pay for a good minus the amount the buyer actually has to pay for it.
