问题题干答案解析相关问题热门问题最新问题

问题详情

已知A^2=E,则A^-1=（）

A、A^3

B、A^2

C、E

D、A

时间：2021-09-02 13:57 关键词：和学华北水利水电大学水利水电工程高等数学

答案解析

D

相关问题

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
_________ in a person’s speech or writing usually ranges on a continuum from casual or colloquial to formal or polite according to the type of communicative situation.
CASE OF DEATH OR SERIOUS INJURY TO A PERSON IN AN ACCIDENT OR SHIPPING DISASTER is（）.