[单选题]

A.1/2~1/5

B.1/3~1/10

C.1/5~1/20

D.1/20~1/50

E.1/50~1/1000

参考答案与解析:

相关试题

<img border="0" style="width: 459px; height: 25px;" src="https://img.zha