• 2022-06-01
    已知bb= [[1,2,3],[4,5,6],[7,8,9]],则表达式 [row[col] for row in bb for col in range(len(row)) if col==1 ] 的值为________。()
    A: [2, 5, 8]
    B: [1,4,7]
    C: [1,2,3]
    D: [3,6,9]