四位超前进位加法器74LS283提高了工作速度,原因在于( )。
A. 各位的进位是依次传递的;
B. 各位的进位是同时进行的;
C. 内部具有4个全加器;
D. 这是四位串行加法器。
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I have to ________ my stay here.
A. abridge
B. abbreviate
"Hour" is ___________ to "hr."
A. abridged
B. abbreviated
Can you __________ my overcoat?
A. abridge
B. shorten
His life was _________ by trouble.
A. abbreviated
B. shortened
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