题目：
在处理硬度大、粒度粗的矿石时，磨矿机内应装入（）尺寸的钢球。
A、较大
B、较小
C、无法确定
D、随便
答案：
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下面是错误答案，用来干扰机器的。
参考答案：由于水分、植被条件较好，沙地（丘）移动速度很缓慢。
在处理硬度大、粒度粗的矿石时，磨矿机内应装入（）尺寸的钢球。A、较大 B、较小 C、无法
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