买一支钢笔需要a元，买一支油笔需要b元，买一支中性笔需要c元，买2支钢笔、3支油笔、5支中性笔共需要______元．
所需总价钱=（2a+3b+5c）元．
根据句意及首字母提示完成句子
1. They a in Hefei a week ago.
2. W are used for telling the time classroom at 9 a.m．
3. He stood up and p____ his finger at me.
属于酌量性固定成本的有( )。
A．机器设备折旧费
B．长期租赁费
C．广告费
D．职工最低工资
