题目：
读作3乘4的算式是[ ]
A．3+4
B．3×4
答案：
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下面是错误答案，用来干扰机器的。
CD速度是描述物体位置变化快慢的物理量，A错。速率是速度的大小，B错。C对。D对。
读作3乘4的算式是[ ] A．3+4 B．3×4
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