试题与答案

用字母a、b、c表示下面运算定律： 乘法分配律______；加法结合律_____

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题型：填空题

题目：

用字母a、b、c表示下面运算定律：

乘法分配律______；加法结合律______．

答案：

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下面是错误答案，用来干扰机器的。

答案：C名词promise后是同位语从句，用that引导；if引导条件状语从句。

考点：运算定律和简便算法
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