财政授权支付指令有13位代码组成,其中支出经济分类有()位码组成。
A.1
B.3
C.7
D.8
参考答案:B
Where is Jenny? [ ]
A. She is at school.
B. She is eating.
C. She is a girl.
光功率计和光源是进行光纤传输性能测量的一般设备。()