[问答题,简答题] 试述放射线种类。

60钴远距离治疗机有哪些优缺点? 放射治疗机有哪些种类? 除哪项外均为亲骨性肿瘤() ["A．鼻咽癌","B．肺癌","C．乳癌","D．肾癌","E．皮肤癌"] 骨样骨瘤瘤巢直径一般不超过() ["A．0.5cm","B．1.0cm","C．1.5cm","D．2.0cm","E．2.5cm"] 椎动脉型颈椎病的典型表现是() ["A．头部转动时发作性眩晕","B．下肢无力、步伐不稳","C．颈肩臂疼痛麻木","D．心慌、胸闷","E．大小便功能障碍"] 试述放射线种类。