关键路线
参考答案：从起始节点到终止节点顺序地将所有事件时差为零的节点连接起来的路线
— Could you tell me _________?
— He often takes a bus.
A．what does Tom usually do
B．where is the post office
C．how Tom often goes to work
D．why Tom sometimes comes late
客房设备用品管理的任务是什么？方法有哪些？
