data。dropna（axis = 1） 是直接删除含有缺失值的行。（ ）

下列选项中，关于dropna（）方法描述正确的是（）。 A: dropna（）方法只会删除值为NaN的数据 B: dropna（）方法不会删除值为None的数据 C: dropna（）方法会删除值为None和NaN的数据 D: dropna（）方法只会检测缺失数据和空值

对于DataFrame对象，dropna 默认丢弃任何缺失值

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

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

若要对Data类中重载的加法运算符成员函数进行声明,下列选项中不正确的是_____。 (多选题) (多选题) (多选题) A: Data +(Data); B: Data operator+(Data); C: Data +operator(Data); D: operator+(Data,Data);