查找标准文献的途径主要有()
A.标准号;
B.常用法;
C.分类;
D.主题。
参考答案:A, C, D
There's _____ beef in the refrigerator. Go and buy some.[ ]
A. little
B. a little
C. few
D. a few
会计记账凭证的档案保管期限是10年。 ( )