皮皮学，免费搜题
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【多选题】
骨组织十分坚硬的原因包括
A.
羟磷灰石结晶与胶原原纤维紧密结合
B.
骨基质结构呈板层状
C.
骨细胞与羟磷灰石结晶紧密结合
D.
基质内含大量骨盐
E.
胶原纤维排列成层,相邻两层相互垂直
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