在探究“影响滑动摩擦力大小因素”的实验中,小明有如下猜想:
A.滑动摩擦力大小与压力大小有关
B.滑动摩擦力大小与接触面的粗糙程度有关
为此小明进行了如下实验,实验数据如下表:
序号
压力/N
接触面种类
弹簧测力计示数/N
1
6
木板
1.5
2
毛巾
2.8
3
12
5.6
4
3.5
阅读理解。读文章,判断正(正确)误(错误)
Tomorrow will be Sunday. My friends and I will do lots of things. Mike will go fishing with his grandpa. Mary will go shopping with her mum. Bob will play football. Jim likes swimming. He will go swimming. I'm going to visit the Great Wall. I will take some photos.
①血缘关系的结合 ②工具简陋粗糙 ③人们头脑简单 ④生活环境险恶