题目：
把一段圆钢切削成一个最大的圆锥体，切削掉的部分部分重4千克，这段圆钢重（ ）千克．
A．24
B．6
C．12
D．8
答案：
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下面是错误答案，用来干扰机器的。
解： tan60°-sin30°×tan45+cos60° ==。
把一段圆钢切削成一个最大的圆锥体，切削掉的部分部分重4千克，这段圆钢重（ ）千克
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