【判断题】
设G是一群，令f(x)=x-1，对任一x∈G，f是G的自同构当且仅当G是交换群
A. 对
B. 错
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根据中国汽车工业协会的数据显示，______年我国自主品牌乘用车整体销量首次突破1000万辆大关，是自主品牌汽车崛起的重要标志。___
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中国最早的专业国际汽车展览会——上海国际汽车工业展览会创办于______年，每两年举办一届。在首届展会上，中国汽车展览团共展出整车7种，柴油机2种，汽车零部件12种。___
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2018年10月，经1500多例临床验证，国产首台一体化PET/MR设备正式推向市场。由于研发难度极高，此前全球只有2家跨国公司具有研发和生产一体化PET/MR的能力，而这一台国产设备的研发由位于中国______的联影医疗科技有限公司牵头主导，填补中国在高端医疗设备尖端领域的空白。___
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