问题
选择题
The twins are so alike that their classmates always mistake one________the other. [ ]
A. by
B. for
C. at
D.in
答案
答案：B
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The twins are so alike that their classmates always mistake one________the other. [ ]
A. by
B. for
C. at
D.in
答案：B
小青同学在研究杠杆的平衡条件时，他先保持动力臂L1和阻力臂L2不变，并进行了实验，记录的实验数据如下表所示．
| F1/N | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 |
| F2/N | 0.4 | 0.8 | 1.2 | 1.6 | 2.0 | 2.4 |