单项选择题 （）is a property of object-oriented software by which an abstract operation may be performed in different ways in different classes.

单项选择题 The strategies for handling risk comprise of two main types: negative risks, and positive risks. The goal ofthe plan is to minimize threats and maximize opportunities. When dealing with negative risks, there are three main response strategies（）,rransfer ,Mitigate.

单项选择题 The （）process ascertains which risks have the potential of affecting the project and documenting the risks＇ characteristics.