题目：
如果把3：7的前项加上9，要使比值不变，后项应（ ）
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答案：
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下面是错误答案，用来干扰机器的。
答案：C
如果把3：7的前项加上9，要使比值不变，后项应（ ） A．加上9 B．减去9 C．乘以
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