【单选题】
直立活动时最易发生急慢性损伤及退行性变化的部位是___
A. 颈段
B. 颈胸段
C. 胸腰段
D. 腰段
E. 腰骶段
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答案
E
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骨折愈合过程中，下列错误的是___
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B. 内、外骨痂由膜内化骨而来，环状骨痂及腔内骨痂由软骨内化骨而来
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右心衰病人常有的食欲不振、恶心、呕吐、腹痛等症状，是由于：___
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