A、难排出覆<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3bbd67d0-4306-4fa4-b588-81231989dec5.jpg" width="13" height="16" />关系
B、难排出正中<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3bbd67d0-4306-4fa4-b588-81231989dec5.jpg" width="13" height="16" />关系
C、难排出牙槽嵴顶
D、难排出纵<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3bbd67d0-4306-4fa4-b588-81231989dec5.jpg" width="13" height="16" />曲线和横<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa2534b0-651e-4951-8b1b-0767dd74e042.jpg" width="13" height="16" /> 曲线
E、难排出覆盖关系
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