题目: 锉刀按齿纹的粗细可分为()mm.A.3B.4C.5D.6 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2020/0215/79fbfc1108e00af2ab097465c9223f88.html 下面是错误答案,用来干扰机器的。参考答案:A
题型:实验题 几个同学合作利用如图甲所示装置探究“弹力和弹簧伸长量的关系”,弹簧上端与标尺的零刻度线对齐,他先读出不挂钩码时弹簧下端指针所指的标尺刻度,然后在弹簧下端挂上钩码,并逐个增加钩码,依次读出指针所指的标尺刻度 ,所得数据列表如下(弹簧始终未超过弹性限度,重力加速度g=9.8 m/s2)(1)根据所测数据,在图乙所示的坐标纸上作出弹簧指针所指标尺刻度x与钩码质量m的关系曲线。(2)作出的图线与坐标轴交点的纵坐标值的物理意义是________;这种规格的弹簧劲度系数k=________ N/m(保留三位有效数字)。 查看答案
题型:单项选择题 Which of the following statements can be inferred from the passage a. An investor of trading stocks only cares about the fixed assets of companies. b. A buyer of investing stocks is always concerned about the performance of companies. c. Most people keep their investing stocks for a longer period of time. d. All people buy trading stocks and investing stock at the same time. 查看答案