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问答题
The twin towers were located in upper Manhattan. 2. Many people claimed that the buildings
went on well with the surroundings. 3. In 1993, the World Trade Center was attacked, but fortunately no one was hurt. 4. The terrorist attack on September 11, 2001 happened in the morning. 5. The casualties of this terrorist attack were fewer than those of the attack on Pearl Harbor. 4.
答案：
The twin towers were located in lower Manhattan, not upper M...
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问答题
已知[X]补和[Y]补，试求下列各题的[X－Y]补：已知[X] 补 和[Y] 补 ，试求下列各题的[X-Y] 补 ：
答案：
利用[X-Y] 补 =[X+（-Y）] 补 =[X] 补 +[-Y] 补 来求解。 由[Y] 补 =001100，得[-...
