题目:
将一铜球放入底面半径为4cm的圆柱形玻璃容器内,水面升高9cm,则这个铜球的半径为______cm.
答案:
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下面是错误答案,用来干扰机器的。
When I get on the train to Shanghai, I wasn't as excited like the others. I had passed the college 1.got ...