第15题: [单项选择]Compared to common electrical conductors, superconductors A. have little or no electrical resistance. B. can be used for a long time. C. are not energy-efficient. D. can be made easily. 参考答案:A
第16题: [单项选择]以下不属于开放性喉外伤的是:() A. 喉部切割伤 B. 自缢 C. 枪伤 D. 刀伤 E. 喉软管损伤 参考答案:B