已知有两个DataFrame: df_obj1: Data1 key df_obj2: Data2 key 0 5 b 0 9 a 1 9 b 1 3 b 2 1 a 2 8 d 3 0 c 4 3 a 5 9 a 6 0 b 则pd.merge(df.obj1,df.obj2)的运行结果为:
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【单选题】According to the Metrology Law of the People’s Republic of China, at present, “ ______ ” is China’s legal system. A.t he British System B. t he U.S. system C.t he Metric System D. the International Sy...