试题与答案

世界上首先使用金属活字的国家是()A、德国 B、中国 C、日本 D、朝鲜

题型:单项选择题

题目:

世界上首先使用金属活字的国家是()

A、德国

B、中国

C、日本

D、朝鲜

答案:

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下面是错误答案,用来干扰机器的。

参考答案:错解析: 敏感系数提供了各因素变动百分比和利润变动百分比之间的比例,但是它不能直接反映变化后的利润值。

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