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。
1. was sent 2. were grown, sold 3. will help 4. can be borrowed 5. was heard 6. saved, was saved 7. was sent for 8. are made, Does make...
