铁碳合金状态图描述的是铁碳合金什么之间的关系 A.性能 B.组织 C.成分 D.温度

标签： 机械制造基础（武汉科技大学）章节测试答案

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  下列说法错误的是（?）。 A.因果效应是指因变量T改变一个单位时，果变量Y的变化程度。 B.因果的关键因素是平衡混淆变量X的分布。 C.因果推理的关键因素是保证其它变量不变，改变果变量Y。 D.因果的定义是变量T是变量Y的原因，当且仅当保持其它所有变量不变的情况下，改变T的值能导致Y的值发生变化。

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  虱叮咬人可传播战壕热。（ ） A.错 B.对

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  What did the author learn from his fourteen days’ digital detox experience?（） A.He realized that addictive bits of online content should not replace thoughtful articles and good books and it’s reading that nourishes the mind. B.Paul Miller’s personal experiment of going offline one full year and his discoveries prompted the author to try a digital detox himself. C.The author didn’t find that technology is evil. Rather, he felt that he liked it even more. D.As CEO of a social media company whose life has been spent mostly online, he wanted to step back and get some perspective.