题目内容
The Zhou gained power from their ability to extract iron from rocks and used the metal to create powerful weapons.
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The Qin standardized weights and measures and carried out irrigation projects..
There are indications of an earlier Xia Dynasty, but the Shang were the first dynasty to leave written records .
It was during this period of instability that a great teacher named Confucius tried to develop good government.
循环语句for($n = 10;$n>=0; $n--)的循环次数为（ ）。
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