问题
选择题
—Physics _______ more difficult than Chinese, do you think so?
—Yes, I think so.[ ]
A. is
B. are
C. has
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—Physics _______ more difficult than Chinese, do you think so?
—Yes, I think so.[ ]
A. is
B. are
C. has
答案：A
如图甲所示，为某同学测绘额定电压为2.5V的小灯泡的I—U特性曲线的实验器材．
|
（3）实验中测得有关数据如下表：
| U/V | 0.40 | 0.80 | 1.20 | 1.60 | 2.00 | 2.40 | 2.80 |
| I/A | 0.10 | 0.16 | 0.20 | 0.23 | 0.25 | 0.26 | 0.27 |
（4）若已知小灯泡灯丝在27℃时电阻值约为1.5Ω,并且其电阻值与灯丝的热力学温度成正比,试估算该灯泡以额定功率工作时灯丝的温度约为 ℃(保留三位有效数字)。