在项目建设实施工程中，工程管理的核心是（）。
A.合同管理
B.信息管理
C.劳务管理
D.进度管理
参考答案：A
说明低频减载的工作原理。
Questions 16 to 20 are based on the following talk.
A. Even strangers to England have a clear vision about a traditional British breakfast. B. A traditional British breakfast is not nourishing and so is added with more protein. C. The traditional British breakfast at a greasy caré is less than 50% the atmosphere. D. The traditional British breakfast is getting more popular in London.
