影响小儿生长发育的2个最基本因素__________和_________。
参考答案：遗传因素；外界环境
A work breakdown structure (WBS) is a tool used to define and group a project's discrete work elements in a way that helps organize and define the total work scope of the project. A WBS is most useful for（）
A.identify ingindividual tasks for a project
B.scheduling the startoftasks
C.scheduling the end oftasks
D.determining potential delays
处级助理及以下人员请假（）天及以上者，由分管副总裁/事业部经理审批。
A、3
B、7
C、10
