In project management, a（）(1) is a listing of aproject's milestones, activities, and deliverables, usually with intended start and finish dates. Those items are often estimatedin terms of resource （）(2) ,budget and duration, linked by dependencies and scheduled events.

空白（1）处应选择（）

A.schedule

B.activity

C.plan

D.contractor

图为商店常用称量货物的台秤．

（1）台秤是个不等臂杠杆，请你根据杠杆的平衡条件，说明用几个不重的秤砣就能平衡盘中重得多的货物的道理：___________________________________；

（2）如果秤砣磨损了，称量结果比实际质量偏______________．

（3）如果调零螺母的位置比正确位置向右多旋进了一些，称量结果比实际质量偏_____________．