如果A2=10E，则(A+3E)-1=
D
本题考查矩阵逆的求法。A2-9E=E，(A+3E)(A-3E)=E，(A+3E)-1=A-3E
对一个矩阵A＝（aij）m×n施行以下几种类型的变换，下列哪项不是矩阵的初等行变换（）。
Agricltural changes in the late 18th and early 19th centuries in England were so great that they were worthy of the term “ ________ ”.
_____he speaks softly is no proof that he is kind.
Your bike needs_____.You ‘d better do i right now.
________，he had no time to rest.
In the United Kingdom, the party which wins the ________ number of seats in the House of Commons becomes the official Opposition.
We have to wait for the bus, ______?
I can speak_____German.
He drove fast and arrived an hour_____of schedule.
In Canada the federal governments have always been formed by ________.
关于高危新生儿哪项除外（）