醋酸纤维素薄膜电泳时，位于α1区带的血浆蛋白质有() ["A．AAT","B．AAG","C．HDL","D．C3","E．AFP"]
棕漠土
醋酸纤维薄膜电泳时，位于α区带的血浆蛋白质有() ["A．Hp","B．α2-MG","C．Cp","D．AFP","E．TRF"]
下牙槽神经阻滞麻醉时注射针进针深度为() ["A．1～2cm","B．2～2．5cm","C．3～3．5cm","D．3～4cm","E．4～4．5cm"]
腭大孔阻滞麻醉的麻醉部位不包括() ["A．同侧上颌磨牙的腭侧牙龈","B．同侧前磨牙的腭侧牙龈","C．同侧上颌磨牙的腭侧粘骨膜","D．同侧上颌侧切牙的腭侧粘骨膜","E．同侧上颌磨牙的腭侧骨组织"]
简述荒漠土的主要分布区域及主要特征？
