下列表达正确的是() A: pd.date_range('2000-01-01',<br/>'2000-01-03 23:59', freq='4h30T') B: pd.date_range('2000-01-01',<br/>'2000-01-03 23:59', freq='4h30m') C: pd.date_range('2000-01-01',<br/>'2000-01-03 23:59', freq='4h30min') D: pd.date_range('2000-01-01',<br/>'2000-01-03 23:59', freq='4h30minute')

滤镜:wave波纹效果语法:filter: Wave(Add=add,Freq=freq,LightStrength=strength,Phase=phase,Strength=strength)

SAS的FREQ过程输出结果如下：变量STYLE的标签为"Style of homes"，变量BEDROOMS的标签为"Number of bedrooms"，下程序中的哪一个产生了下面显示的输出结果______。[img=254x249]18032802df46410.jpg[/img] A: proc freq data = sasuser.houses; tables style and bedrooms;run; B: proc freq data = sasuser.houses; tables style * bedrooms;run; C: proc freq data = sasuser.houses;tables style , bedrooms;run; D: proc freq data = sasuser.houses;tables style;tables bedrooms;run;

Hip replacement surgery is______joint replacement surgery in the U.S. A: the single most frequent B: the most single frequent C: the single frequent D: a single frequent

分组之后进行summarise(freq = n())，此处的freq表示 A: 每组的记录数 B: 总的记录数 C: 每组的列数 D: 总的列数

周期和频率所对应的英文缩写是Prd和Freq

下列数组声明语句中， 不正确的是___________。 A: Dim a(5) As Single B: Dim a(1 To 5) As Single C: Dim a(0) As Single D: Dim a(5) As Single=(1，2，3，4，5，6)

What kind of filter is used to extract a single-freq. harmonic from the harmonic components contained in square wave? A: Low-pass Filter B: High-pass Filter C: Band-pass Filter D: Band-elimination Filter

下面数组初始化语句正确的是（ ）。 A: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10} B: Dim A( ) As Single={1,2,3,4,5,6,7,8,9} C: Dim A(9) As Single={1,”A”,”BC”,2,3,4,5,6,7,8} D: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10}

下面数组初始化语句正确的是（ ）。 A: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10} B: Dim A( ) As Single={1,2,3,4,5,6,7,8,9} C: Dim A(9) As Single={1,”A”,”BC”,2,3,4,5,6,7,8} D: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10}