On some projects，especially ones of smaller scope，activity sequencing, activity resource estimating, activity duration estimating, and （70） are so linked that they are viewed as a single process that can be performed by a person over a relatively short period of time.

A．time estimating

B．cost estimating

C．project planning

D．schedule development

按照退休人员的需求组织讲座时，要通过张榜公告、（）等方式告知讲座的内容、时间和地点，请退休人员报名参加

A、志愿者上门

B、自我管理和互助组织传达

C、街道劳动保障机构的负责人上门

D、社区主任传达