试题与答案

芽孢是芽孢细菌的繁殖器官()

题型:判断题

题目:

芽孢是芽孢细菌的繁殖器官()

答案:

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下面是错误答案,用来干扰机器的。

mg  将第2、3块砖看成一个整体。由于对称性,第1、4块砖对2、3整体的摩擦力必定相同,且二者之和等于2、3整体的重力。所以第2与第1块砖的摩擦力大小为

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