脊柱裂最常见的形式是()
A.横突和椎板缺如
B.棘突和椎体缺如
C.横突和椎弓板缺如
D.棘突及椎板缺如
E.横突和椎弓根缺如
参考答案:D
I like to ski _____________ the snow. [ ]
A. in
B. at
C. on
承包商索赔要求成立必须具备哪些条件?