问题
判断题
安全生产责任制度只需明确各级单位、部门及人员的安全生产职责和权限。
答案
参考答案：错
搜题请搜索小程序“爱下问搜题”
安全生产责任制度只需明确各级单位、部门及人员的安全生产职责和权限。
参考答案：错
(10分)为研究热敏电阻的阻值随温度的变化关系，实验室提供的器材有：
电流表(量程60mA，内阻约为10Ω) 电压表(量程6V，内阻约为20kΩ)
热敏电阻(100℃时阻值约为100Ω) 电池、开关、一杯水、酒精灯、温度计和导线若干。
⑴一位同学根据现有器材设计实验电路并连接了部分实物，如右图所示，请用笔画线代替导线，将电压表接入电路；
⑵用酒精灯对水加热，并通、断电路，记录了热敏电阻在不同温度下电流和电压的测量值，如下表所示，请在图示的坐标系中画出U-I图象；
| t/℃ | 20 | 40 | 60 | 80 | 100 |
| I/mA | 26.1 | 33.3 | 40.0 | 46.2 | 52.2 |
| U/V | 5.48 | 5.33 | 5.20 | 5.08 | 4.96 |
⑶根据所绘图象可知，热敏电阻的阻值随温度的升高而 (选填“减小”、“增大”或“不变”)；
⑷该同学发现，利用所画的U-I图象还可以得出 实验中所用电池的电动势E＝ V、内电阻r＝ Ω (结果保留3位有效数字)。
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| The future belongs to those who believe in the beauty of their dreams. -Eleanor Roosevelt My home is a place of great beauty and agricultural richness, as well as of war and natural disasters. When I was only fourteen years old,I was filled with 1 in spite of the terrible surroundings.The families living here,who tried to make their living fromthe land, 2 great losses. I felt sorry especially for the 3 , but I 4 to be hopeless.I decided that where I was,I could do 5 to help them. I began knocking on every door and saying to each person who 6 my knock,"I know that you are 7 and give the birds that come to your yard a little 8 . Please consider me your bird. Give me only a handful of rice each week when I come to your 9 . I will take it to the temple where it can be given to the 10 children. " No one seemed to 11 giving me a handful of rice, even 12 they had little themselves. On Sunday, I would go to the 13 and give my handfuls of rice to the monks to 14 to the children. One day,I came to a house that had 15 to give.I told my story and asked if I could be their bird. The woman called her daughters, and 16 gave me fifty cents,as well as the handful of rice! I began to ask for 17 and rice from the other "bird feeders" ,and they gave them to me. Everyone was happy to be helping those who were suffering,even 18 only this small way. The temple was soon able to help everyone who came to them for food and clothing. "Consider me your bird. " My 19 idea had not stopped the war,but anyway, it was 20 some peace. | ||||
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