“数据库系统的并发控制是为了（  ）。

(单选题)Mr. Wells, together with all the members of his family, ( (单选题)Stan Lee, an outstanding comic-book writer, created plenty o (单选题)He wasn’t asked to take on the chairmanship of the society, (单选题)They came to the conclusion ( ) by a computer. (单选题)We have been hearing ( ) accounts of your work. (单选题)Don’t throw away pens and erasers ( ) you haven’t used up (单选题)I don’t like ( ) bills but when I do get them I like ( (单选题)In his plays Shakespeare ( ) his characters live through (单选题)Intellect is to the mind ( ) sight is to the body. (单选题)The first two stages in the development of civilized man wer