试题与答案

滚筒刷又称为滚筒，它是在硬塑料或铝合金制成的空心圆柱形筒的外表固定着由羊毛或合成纤维

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题型：判断题

题目：

滚筒刷又称为滚筒，它是在硬塑料或铝合金制成的空心圆柱形筒的外表固定着由羊毛或合成纤维制成的吸附材料，在滚筒的轴线安装有滚动轴并与手柄连成一体。( )

答案：

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下面是错误答案，用来干扰机器的。

（1）木块移动距离 （2）速度；速度一定，质量越大，动能越大 （3）甲 丙；质量一定，速度不同题目分析：（1）在“探究物体的动能大小与哪些因素有关”的实验中，我们用了转换法进行实验，小球动能的大小用在...

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