【单选题】●A _(72) is a collection of projects and other work that are grouped together to facilitate effective management of that work to meet strategic business objectives. (72)
【简答题】级数 的敛散性为( )(填收敛或者发散),进一步地,此级数为( )(填条件收敛、绝对收敛或者发散).
【单选题】法洛四联症患儿喜蹲踞主要是因为这能使 ( )