切牙乳头又称腭乳头，是哪个神经的麻醉处 ["A．鼻腭神经 ","B．腭前神经 ","C．上牙槽前神经 ","D．上牙槽中神经 ","E．上牙槽后神经"]
简述商主体不同于一般民事主体的法律特征
支配上颌前磨牙及第一磨牙近中的牙髓及其颊侧黏骨膜的为 ["A．上牙槽后神经 ","B．上牙槽中神经 ","C．上牙槽前神经 ","D．鼻腭神经 ","E．腭前神经"]
当淋巴结出现肿大和疼痛时，是因为所收纳的范围内存在 ["A．炎症 ","B．外伤 ","C．癌症 ","D．异物 ","E．畸形"]
翼静脉丛位于 ["A．颞下窝","B．眶下间隙","C．嚼肌间隙","D．口底","E．颊间隙"]
商法的特征
