选取data第一行第一列的数据 A: data.loc[:1] B: data[1] C: data.iloc[1:2,1:2] D: data[1:2]

data是DataFrame类型的对象，与data['visits']语句的功能相同的语句是（ ）。 A: data.iloc[1:3] B: 其它均正确 C: data. visits D: data.iloc['visits']

2. 下列loc、iloc、ix属性的用法正确的是（）

以下哪个不是Android手机常见的应用程序？（ ） A: \data\data\com.tencent.mm B: \data\data\com.tencent.mobileqq C: \data\data\com.eg.android.AlipayGphone D: \data\data\com.tencent.xin

利用.iloc()方法可以实现对数据框的单行、多行、单列以及多列数据的修改（ ）

已知有n个数据进行排序，下面能实现排序的是 A: data=[34,5,-6,12,87,29]data.sort() B: data=[34,5,-6,12,87,29]n=len(data)od=[]whileiwhilejifdata[j]>data[j+1]:t=data[j]data[j]=data[j+1]data[j+1]=tj+=1i+=1 C: data=[34,5,-6,12,87,29]n=len(data)i=0j=0whileiwhilejifdata[j]>data[j+1]:t=data[j]data[j]=data[j+1]data[j+1]=tj+=1i+=1print(data) D: data=[34,5,-6,12,87,29]n=len(data)i=0j=0whileiwhilejifdata[i]>data[j]:t=data[i]data[i]=data[j]data[j]=tj+=1i+=1

有如下程序 #include intchange(int*data) { *data=*data%2; return(*data)+1; } main() { intdata=12; change(&data); printf("%d,",data); data=change(&data); printf("%d,",data); } 程序运行后的输出结果是()

The data collected by the statistical survey can be original data or secondary data. The relationship between the original data and secondary data is ( ) A: The original data comes from the grass-roots units, and the secondary data comes from the superior units B: Secondary data is processed from original data C: There is no necessary connection between the original data and the secondary data D: There is no difference between primary data and secondary data

What is stored in the database is（ ）. A: data B: data mode C: links between data D: data and the connection between data

有如下程序 #include int test(int *data) { return --(*data); } main() { int data = 12; test(&data); printf("%d,", data); data = test(&data); printf("%d,", data); } 程序运行后的输出结果是