委托外单位加工的存货，其计价标准有( )。
A．协议确认
B．实际耗用的原材料
C．加工费用
D．交纳的税金
E．标准计价原则法
参考答案：B,C,D
Justin Banks just won the lottery and is trying to decide between the annual cash flow payment option or the lump sum option. He can earn 8 percent at the bank and the annual cash flow option is $100000/year, beginning today for 15 years. What is the annual cash flow option worth to Banks today（）
A. $ 924423.70
B. $ 855947.87
C. $1500000.00
α-丙氨酸是组成人体蛋白的氨基酸之一，右图是α-丙氨酸的分子结构模型图，下列对α-丙氨酸的叙述正确的是
A．由碳、氢、氧、氮四种原子构成
B．氢元素的质量分数最大
C．化学式为C3H7O2N
D．属于氧化物
