A schedule is commonly used in project planning and project portfolio management.（）on a schedule may be closely related to thework breakdown structure (WBS) terminal elements, the statement of work, or a contract data requirements list.

单项选择题ATM (Asynchronous Transfer Mode)technology combines connection oriented mechanism and（） mechanism.

A.circuit switching
B.packet switching
C.message switching
D.voice switching

单项选择题Software engineering is the study and application of engineering to the （）, development and maintenance of software.

A.research
B.management
C.assembly
D.design