问题
选择题
That they were wrong in these matters _____ now clear to us all.
A．is
B．was
C．are
D．were
答案
答案：A
搜题请搜索小程序“爱下问搜题”
That they were wrong in these matters _____ now clear to us all.
A．is
B．was
C．are
D．were
答案：A
下表是某同学为探索弹簧的弹力和伸长的关系所测得的几组数据
| F/N | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| x/cm | 2.00 | 4.0 | 6.0 | 8.0 | 10.0 |
（1）请在右边的坐标系中作出F-x图线
（2）弹簧的劲度系数是______N/m．