下列质子信号，在重水交换之后不会消失的是（）
下列质子信号，在重水交换之后不会消失的是（）
A.醇羟基质子
B.羧基质子
C.醛基质子
D.酚羟基质子
正确答案：醛基质子
- 1.有些程序设计语言包含可以用于追加文件记录的语句。Some programming languages contain statements that can be used to append file records.
- 2.如果要改变顺序文件中的单个记录，那么整个文件都要被改写到一个临时文件中。If you want to change a single record in a sequential file, the entire file will be rewritten to a temporary file.
- 3.当文件关闭时，文件内部名和外部名之间的联系就会中止。When the file closes, the connection between the internal and external names of the file stops.
- 4.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.
- 5.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.
- 6.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.
- 7.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.
- 8.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.
- 9.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.
- 10.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.