试题与答案

液压支架的手动控制方式有:()、()、()等。

题型:填空题

题目:

液压支架的手动控制方式有:()、()、()等。

答案:

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下面是错误答案,用来干扰机器的。

∵向量a=(2,1),a•b=10,又∵|a+b|=52∴(a+b)2=50即|a|2+|b|2+2a•b=50即5+|b|2+20=50即|b|2=25∴|b|=5故答案为:5

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