常用的存储过程不包括（）。 A: sp_tables B: sp_columns C: sp_stored_procedures D: sp_renametable

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.

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

生物碱分子中氮原子杂化方式与碱性大小的关系是（） A: sp>sp>sp B: sp>sp>sp C: sp>sp>sp D: sp>sp>sp E: sp>sp>sp

不同杂化类型碳原子电负性由强到弱的顺序是（）。 A: sp³＞sp²＞sp B: sp²＞sp＞sp³ C: sp²＞sp³＞sp D: sp＞sp²＞sp³

就生物碱分子中N原子未共用电子对杂化方式而论，其碱性顺序为（） A: sp>sp>sp B: sp>sp>sp C: sp>sp>sp D: sp>sp>sp E: Sp>sp>sp

生物碱分子中氮原子杂化方式与其碱性强弱的关系是（） A: SP＞SP＞SP B: SP＞SP＞SP C: SP＞SP＞SP D: SP＞SP＞SP

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.