A.前移B.后移C.不動(dòng)D.不確定
A.卷曲彈性率B.卷曲率C.卷曲數(shù)D.彎折角
A.卷曲數(shù)和卷曲率都小B.卷曲數(shù)和卷曲率都大C.卷曲數(shù)和卷曲率不變D.卷曲率小