These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.

A．not if solved properly

B．if solved properly

C．if not solved properly

D．not if properly solved

根据生产与存货业务循环内部控制的要求，负责存货永续盘存记录的部门应当是______。

A．验收部门

B．生产部门

C．财务部门

D．采购部门