骨的基本结构主要包括哪三个部分?( )
A:骨松质、骨密质和骨髓
B:骨膜、骨质和骨髓
C:骨松质、骨密质和骨膜
D:骨质、骨髓和骨髓腔
—I think it is enjoyable, I sometimes have some trouble in study.