What are the features of columns?（ ） A: Columns are usually characterized by fixed names and locations. B: Columns are printed pages where manuscripts of certain contents are published. C: Columns are relatively independent in the overall layout of newspapers and periodicals. D: Articles in columns are of various styles.

智慧职教: 以priv结尾的字段一般代表user表中（  ）字段列？

If a is known to be a 2×3 matrix, then after executing a=a(:), ( ). A: a transforms to a column vector B: a transforms to 3 rows and 2 columns C: a transforms to 3 rows and 3 columns D: a transforms to 2 rows 3 and columns

MySQL在user表中的的相关权限字段，都是以_priv结尾的

Which of the following are the types of columns encountered in gas chromatography?(1) flat plates (2) packed columns (3) plastic strips (4) open tubular, or capillary columns A: 1,2 B: 3, 4 C: 1, 3 D: 2,4

The Greek orders of columns are used including

The product of two matrices ,AB is defined. Then each column of AB is a linear combination of the columns of B using weights from the corresponding columns of A.

columns_priv表可以对单个数据列的权限进行设置。

If it is known that A is a 3×5 matrix, after executing A(:,1:2:3)=[], ( ). A: A becomes row vector B: A becomes 3 rows and 3 columns C: A becomes 3 rows and 2 columns D: A becomes 2 rows and 3 columns

下列MySQL命令正确的是( ) A: show databases; B: show tables; C: show columns; D: show columns from customers;