A.造血能力强 | B.硬度小,弹性大 |
C.易发生骨折 | D.既坚固又有弹性 |
A.肱二头肌和肱三头肌都收缩 |
B.肱二头肌和肱三头肌都舒张 |
C.肱二头肌收缩,肱三头肌舒张 |
D.肱二头肌舒张,肱三头肌收缩 |
A.软骨层骨化成骨 | B.红骨髓变为黄骨髓 |
C.成骨细胞不再分裂 | D.生长激素不再分泌 |
2 |
3 |
1 |
3 |
A.既坚固又有弹性 | B.造血功能强 |
C.硬度小,弹性大 | D.容易发生骨折 |
A.肱二头肌收缩 |
B.肱二头肌舒张、肱三头肌收缩 |
C.肱三头肌舒张 |
D.肱二头肌收缩、肱三头肌舒张 |
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