A. children never benefit from ear surgery. B. tympanostomy tubes result in deafness. C. some surgeons are too eager to operate. D. ear tube operations are too expensive. 参考答案:C 答案解析:根据Kleinman医生的调查,“...it's being vastly overused”,而且“...fewer than half were clearly justified.”由此看来,有
第33题: [单项选择]判断肌肉活力的标准中最可靠的是 A. 颜色 B. 张力 C. 收缩 D. 出血 E. 完整性 参考答案:A 答案解析:一般来说色泽鲜红,切割时切面渗血,钳夹时有收缩力,肌肉有一定韧性,是肌肉保持活力的良好标志。如色泽暗红无张力,切时不出血,钳夹不收缩,表示无生机,应予清除。但如有外伤性休克和局部组织严重挫伤时,往往只