通常要应用碱性氧化铝色谱分离的化合物为（）。
通常要应用碱性氧化铝色谱分离的化合物为（）。
A.香豆素类化合物
B.蒽醌类化合物
C.甾体皂苷类化合物
D.生物碱类化合物
正确答案：生物碱类化合物
- 1.当文件以Input模式打开时，数据可以被程序写入到这个文件中。When the file is opened in Input mode, the data can be written to the file by the program.
- 2.如果一个文件以Output模式打开，但是该名字的文件已经在硬盘目录中存在，那么后者的所有内容都会被删除。If a file is opened in output mode, but the name of the file already exists in the hard disk directory, then all the contents of the file will be deleted.
- 3.文字处理软件被设计成能读入所有的二进制文件。Word processing software is designed to input all binary files.
- 4.数据文件可以保存程序的输出，以备将来使用。Data files can save the output of the program for future use.
- 5.数据文件可以被一个以上的程序使用。Data files can be used by more than one program.
- 6.因为Score1数组、Score2数组和Score3数组的大小相同，并且相应元素包含相关数据，所以它们叫做平行（parallel）数组。Because Score1, Score2 and Score3 are of the same size and the corresponding elements contain relevant data, they are called parallel arrays.
- 7.在用冒泡排序对数5、30、25、15进行升序排序的过程中，进行了3次交换。In the bubble sort ascending order of number 5, 30, 25 and 15, three exchanges were made.
- 8.如果知道100个元素被分配到二维数组A中，则A的两个下标都必须是从0到9，即A必须是10行和10列。If you know that 100 elements are assigned to a two-dimensional array A, the two subscripts of A must be from 0 to 9, that is, A must be 10 rows and 10 columns.
- 9.一维数组和二维数组必须在同一个语句中声明。One-dimensional arrays and two-dimensional arrays must be declared in the same statement.
- 10.如下声明的数组Character，它表示的字符串长度为10：Declare Chr[10] As CharacterThe array Character declared below represents a string length of 10:Declare Chr [10] As Character