腰椎间盘突出症临床主要表现症状（）
参考答案：腰痛伴下肢放射痛
Could you help me to find out the reason ____ the brake doesn’t work?
A．when
B．how
C．why
D．in which
氟斑牙属于
A．牙齿结构异常B．牙齿形态异常C．牙齿数目异常D．牙齿萌出异常E．牙齿结构形态均异常
