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矩阵初等变换过程中，能否用等号连接?

任何一个矩阵都可以利用初等行变换化为行阶梯形吗？

"They are very informal and relaxed, unlike their publicpersona, and mostly they leave me alone." The underlined word means.

A. image
B. appearance
C. people

"In the recent years of economic boom, the crows have quietlyamassedgreat power." The underlined word means.

A. accelerate
B. access
C. accumulate