会计主管（）至少一次检查有价单证库存。
A.每月
B.每季
C.每半年
D.每旬
参考答案：A
What makes you _____ it's going to rain tomorrow? [ ]
A. to think
B. thought
C. think
D. thinking
PCM通信系统的信息基本传输流程是怎样的？
