事业单位存在的社会基础包括( )。
A．满足公共需要
B．弥补市场缺陷
C．节制政府失灵
D．防止契约失效
E．弥补志愿不足
参考答案：A,B,C,D,E
一根木头锯成7段需42分钟．如果锯成10段需要多长时间？
The accurate declaration for the export goods is made by the （）.
A. consignee or his agent
B. consignor or his agent
C. Customs
D. any person
