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【简答题】
已知a、b、c是直角三角形的三条边，c是斜边，且a、b、c都是正整数，当a=5时，b、c只能是12，13；当a=7时，b，c只能是24，25；当a=9时，b，c可以是40，41，也可以是12，15，你能求出当a=15时，b，c可能取的值吗？
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举一反三
【简答题】已知 a 与b的夹角为60度,求ab=
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Every subject is allocated its own special decimal code.
B.
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C.
Related topics are grouped together by floor.
D.
Numbers are given to the major subjects, called classes.
【简答题】Passage Two Questions 6 to10 are based on the following passage. Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are eras...
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【单选题】What would you predict as the main topic of the next paragraph? the way in which number stations are being demolished how satellite communications are being used by governments to transmit information...
A.
the way in which number stations are being demolished
B.
how satellite communications are being used by governments to transmit information
C.
more reasons why numbers stations have become redundant in recent times
D.
the history of the British Secret Service since the end of the Cold War
【简答题】硬磁盘存储器由磁记录介质、硬磁盘驱动器和________三大部分组成。
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