供电企业对用户送审的受电工程设计文件和有关资料审核的时间，低压供电的用户最长不超过（）。
A.7天
B.10天
C.15天
D.1个月
参考答案：B
读一读，将序号标在括号内。
( ) We had rice,vegetables and fish.
( ) What did you drink?
( 1 ) What did you have for dinner yesterday?
( ) What are you going to have today?
( ) I drank some juice. My father drank some tea.
( ) We are going to have rice,meat and vegetables.
设A是n阶矩阵，|A|=-2，(A+E)3=O，则A*用A，E可表为：A*=______．
