以计算机元器件为标志可将计算机的发展分为哪几个阶段?
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We have made a (an)try to carry out the plan.
A. attempt
B. effort
C. energy
D. source
They were determined to carry out the research at once.
A. fetched
B. conducted
C. attracted
D. pushed
计算机内部信息的表示及存储往往采用二进制形式,采用这种形式的最主要原因是什么?