桡神经支配以下哪些肌肉() ["A．肱二头肌 ","B．肱三头肌 ","C．肱肌 ","D．喙肱肌 ","E．肱桡肌"]
体位确定后，扫描各层面准确与否主要取决于() ["A．扫描检查床 ","B．扫描机架 ","C．准直器 ","D．操作台 ","E．高压发生器"]
试述骨密质和骨松质的分布。
胃癌常转移至()肺癌常转移的部位()食管癌最常转移的部位() ["A．脑 ","B．肝 ","C．肾上腺 ","D．骨 ","E．肾"]
肌皮神经支配以下哪些肌肉() ["A．肱二头肌 ","B．肱三头肌 ","C．肱肌 ","D．喙肱肌 ","E．肱桡肌"]
试述骨的基本构造。
