Question: 国投资本从2025年05月03日到2025年11月18日，简单移动平均的20日线与10日线发生金叉多少次？使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: SMA_n = 1 / n * \sum_{i=0}^{n-1} P_{t-i}
Data:
date,close
2025-04-03,7.12
2025-04-07,6.42
2025-04-08,6.53
2025-04-09,6.76
2025-04-10,6.89
2025-04-11,6.83
2025-04-14,6.83
2025-04-15,6.8
2025-04-16,6.79
2025-04-17,6.78
2025-04-18,6.83
2025-04-21,6.85
2025-04-22,6.93
2025-04-23,6.86
2025-04-24,6.82
2025-04-25,6.87
2025-04-28,6.83
2025-04-29,6.83
2025-04-30,6.84
2025-05-06,6.98
2025-05-07,7.02
2025-05-08,7.03
2025-05-09,6.98
2025-05-12,7.08
2025-05-13,7.07
2025-05-14,7.23
2025-05-15,7.13
2025-05-16,7.01
2025-05-19,7.0
2025-05-20,7.02
2025-05-21,7.02
2025-05-22,6.98
2025-05-23,6.88
2025-05-26,6.91
2025-05-27,6.96
2025-05-28,6.91
2025-05-29,6.97
2025-05-30,6.97
2025-06-03,7.08
2025-06-04,7.13
2025-06-05,7.14
2025-06-06,7.12
2025-06-09,7.18
2025-06-10,7.11
2025-06-11,7.23
2025-06-12,7.3
2025-06-13,7.28
2025-06-16,7.29
2025-06-17,7.38
2025-06-18,7.31
2025-06-19,7.17
2025-06-20,7.12
2025-06-23,7.2
2025-06-24,7.39
2025-06-25,7.64
2025-06-26,7.6
2025-06-27,7.55
2025-06-30,7.52
2025-07-01,7.47
2025-07-02,7.47
2025-07-03,7.49
2025-07-04,7.5
2025-07-07,7.5
2025-07-08,7.61
2025-07-09,7.69
2025-07-10,7.83
2025-07-11,7.9
2025-07-14,7.8
2025-07-15,7.74
2025-07-16,7.7
2025-07-17,7.64
2025-07-18,7.68
2025-07-21,7.78
2025-07-22,7.75
2025-07-23,7.75
2025-07-24,7.91
2025-07-25,7.82
2025-07-28,7.84
2025-07-29,7.85
2025-07-30,7.76
2025-07-31,7.56
2025-08-01,7.56
2025-08-04,7.55
2025-08-05,7.66
2025-08-06,7.67
2025-08-07,7.69
2025-08-08,7.66
2025-08-11,7.75
2025-08-12,7.83
2025-08-13,7.95
2025-08-14,8.02
2025-08-15,8.23
2025-08-18,8.21
2025-08-19,8.23
2025-08-20,8.41
2025-08-21,8.37
2025-08-22,8.53
2025-08-25,8.68
2025-08-26,8.69
2025-08-27,8.38
2025-08-28,8.51
2025-08-29,8.34
2025-09-01,8.19
2025-09-02,8.1
2025-09-03,7.88
2025-09-04,7.81
2025-09-05,7.8
2025-09-08,7.8
2025-09-09,7.74
2025-09-10,7.7
2025-09-11,7.89
2025-09-12,7.74
2025-09-15,7.69
2025-09-16,7.63
2025-09-17,7.84
2025-09-18,7.61
2025-09-19,7.57
2025-09-22,7.6
2025-09-23,7.5
2025-09-24,7.73
2025-09-25,7.61
2025-09-26,7.76
2025-09-29,8.0
2025-09-30,7.89
2025-10-09,7.88
2025-10-10,7.96
2025-10-13,7.87
2025-10-14,7.86
2025-10-15,7.94
2025-10-16,7.87
2025-10-17,7.64
2025-10-20,7.68
2025-10-21,7.77
2025-10-22,7.72
2025-10-23,7.81
2025-10-24,7.93
2025-10-27,7.98
2025-10-28,7.89
2025-10-29,8.05
2025-10-30,7.93
2025-10-31,7.84
2025-11-03,7.8
2025-11-04,7.79
2025-11-05,7.77
2025-11-06,7.88
2025-11-07,7.81
2025-11-10,7.89
2025-11-11,7.82
2025-11-12,7.74
2025-11-13,7.79
2025-11-14,7.71
2025-11-17,7.63
2025-11-18,7.59

Indicator data:
date,20日,10日
2025-05-06,6.8195,6.864
2025-05-07,6.8145,6.883
2025-05-08,6.845000000000001,6.901000000000001
2025-05-09,6.8675,6.906000000000001
2025-05-12,6.8835,6.928
2025-05-13,6.8925,6.953
2025-05-14,6.9125,6.989
2025-05-15,6.9275,7.019
2025-05-16,6.938,7.037000000000001
2025-05-19,6.9485,7.053
2025-05-20,6.960500000000001,7.0569999999999995
2025-05-21,6.969999999999999,7.057
2025-05-22,6.9765,7.052000000000001
2025-05-23,6.974000000000001,7.042
2025-05-26,6.9765,7.025
2025-05-27,6.983500000000001,7.014
2025-05-28,6.9855,6.981999999999999
2025-05-29,6.9925,6.965999999999999
2025-05-30,6.9995,6.961999999999999
2025-06-03,7.011500000000001,6.969999999999999
2025-06-04,7.019,6.981
2025-06-05,7.025,6.993
2025-06-06,7.0295000000000005,7.007
2025-06-09,7.039500000000001,7.036999999999999
2025-06-10,7.0409999999999995,7.0569999999999995
2025-06-11,7.049000000000001,7.0840000000000005
2025-06-12,7.052499999999999,7.123
2025-06-13,7.06,7.154000000000001
2025-06-16,7.074,7.186
2025-06-17,7.093000000000001,7.216000000000001
2025-06-18,7.1075,7.234
2025-06-19,7.115,7.236999999999999
2025-06-20,7.122,7.237
2025-06-23,7.138,7.239
2025-06-24,7.162000000000001,7.267
2025-06-25,7.196,7.308
2025-06-26,7.230499999999999,7.337999999999999
2025-06-27,7.2595,7.364999999999999
2025-06-30,7.287000000000001,7.388000000000001
2025-07-01,7.3065000000000015,7.397
2025-07-02,7.3235,7.412999999999999
2025-07-03,7.340999999999999,7.445
2025-07-04,7.359999999999999,7.483
2025-07-07,7.3759999999999994,7.513
2025-07-08,7.401000000000001,7.534999999999999
2025-07-09,7.4239999999999995,7.539999999999999
2025-07-10,7.4505,7.563
2025-07-11,7.4815,7.598000000000001
2025-07-14,7.507000000000001,7.6259999999999994
2025-07-15,7.525,7.6530000000000005
2025-07-16,7.544499999999999,7.675999999999999
2025-07-17,7.568,7.691
2025-07-18,7.595999999999999,7.7090000000000005
2025-07-21,7.625,7.737
2025-07-22,7.642999999999999,7.751
2025-07-23,7.6485,7.757000000000001
2025-07-24,7.664,7.765000000000001
2025-07-25,7.6775,7.757000000000001
2025-07-28,7.6934999999999985,7.761
2025-07-29,7.7125,7.772
2025-07-30,7.726999999999999,7.7780000000000005
2025-07-31,7.730500000000001,7.7700000000000005
2025-08-01,7.733500000000001,7.758
2025-08-04,7.736,7.734999999999999
2025-08-05,7.738499999999999,7.725999999999999
2025-08-06,7.7375,7.717999999999999
2025-08-07,7.730500000000001,7.696000000000001
2025-08-08,7.718500000000001,7.68
2025-08-11,7.715999999999999,7.671000000000001
2025-08-12,7.7204999999999995,7.669
2025-08-13,7.733,7.688000000000001
2025-08-14,7.752000000000001,7.734
2025-08-15,7.7795000000000005,7.801
2025-08-18,7.801,7.867
2025-08-19,7.825,7.924000000000001
2025-08-20,7.858,7.998
2025-08-21,7.881,8.065999999999999
2025-08-22,7.916499999999999,8.153
2025-08-25,7.958500000000001,8.245999999999999
2025-08-26,8.000499999999999,8.331999999999999
2025-08-27,8.0315,8.375
2025-08-28,8.078999999999999,8.424
2025-08-29,8.117999999999999,8.434999999999999
2025-09-01,8.15,8.433
2025-09-02,8.172,8.42
2025-09-03,8.182500000000001,8.367
2025-09-04,8.188500000000001,8.311
2025-09-05,8.1955,8.238
2025-09-08,8.198,8.15
2025-09-09,8.1935,8.055000000000001
2025-09-10,8.181000000000001,7.986999999999999
2025-09-11,8.174499999999998,7.925
2025-09-12,8.15,7.865
2025-09-15,8.123999999999999,7.815
2025-09-16,8.094,7.767999999999999
2025-09-17,8.0655,7.764
2025-09-18,8.0275,7.744
2025-09-19,7.9795,7.720999999999999
2025-09-22,7.9254999999999995,7.7010000000000005
2025-09-23,7.866,7.677000000000001
2025-09-24,7.833500000000001,7.6800000000000015
2025-09-25,7.788500000000001,7.652000000000001
2025-09-26,7.7595,7.653999999999999
2025-09-29,7.75,7.685
2025-09-30,7.7395,7.711
2025-10-09,7.7395,7.715000000000001
2025-10-10,7.747,7.75
2025-10-13,7.750500000000001,7.780000000000001
2025-10-14,7.7535,7.806
2025-10-15,7.763499999999999,7.85
2025-10-16,7.772,7.864
2025-10-17,7.7595,7.866999999999999
2025-10-20,7.7565,7.859
2025-10-21,7.7605,7.836
2025-10-22,7.765000000000001,7.819
2025-10-23,7.7635000000000005,7.812
2025-10-24,7.7795000000000005,7.809
2025-10-27,7.8,7.8199999999999985
2025-10-28,7.8145,7.822999999999999
2025-10-29,7.8420000000000005,7.8340000000000005
2025-10-30,7.851999999999999,7.839999999999999
2025-10-31,7.8635,7.859999999999999
2025-11-03,7.8655,7.872
2025-11-04,7.855000000000001,7.8740000000000006
2025-11-05,7.848999999999999,7.8790000000000004
2025-11-06,7.848999999999999,7.886
2025-11-07,7.841499999999999,7.874
2025-11-10,7.842499999999999,7.865
2025-11-11,7.8405000000000005,7.858
2025-11-12,7.830500000000001,7.827000000000001
2025-11-13,7.8265,7.813
2025-11-14,7.83,7.8
2025-11-17,7.827500000000001,7.7829999999999995
2025-11-18,7.8185,7.763

Answer: 4.0