Northern Ireland is the smallest of the four nations, but is quite well-known in the world for____.

The following are the necessary preparations for a tour guide before picking up guests, except for____. A: necessary items preparation B: image preparation C: psychological preparation D: physical preparation

关键路径法是____的工具之一。 CPM is a tool for____. A: 1、活动定义 Activity definitio B: 2、活动排序 Activity sequencing C: 3、活动资源估算 Activity resource estimatio D: 4、制定进度表 Develop schedule