题干

一般的电熨斗用合金丝作发热元件,合金丝电阻随温度t变化的关系如图实线①所示.由于环境温度以及熨斗的散热功率不同,因而熨斗的温度可能会在较大范围内波动,易损坏衣物.有一种用主要成分为BaTIO3,被称为“PTC”的特殊材料作发热元件的电熨斗,具有升温快、能自动控制温度的特点.PTC材料的电阻随温度变化的关系如图实线②所示.

根据图线分析:通电一段时间后电熨斗温度t自动地稳定在____t____范围之内.(填下标数字)

上一题 下一题 0.0难度 选择题 更新时间:2019-10-02 11:14:54

答案(点此获取答案解析)

T6,T7

同类题2

任务型阅读

    Do you know what may make you seem to be not confident enough?____.

    Giving reasons for your actions. Suppose you are having lunch with a group of people, and suddenly you drop your glass of coke on the floor. What will you do? Well, some people will just start to explain why it has happened.____ If you drop a glass or make a mistake, it won't change who you are. It's your right to make a mistake because you are a human being.

    ____ You may have experienced a situation where you told a friend his performance wasn't that good and then he replied back immediately by saying, “No, no, no, it's just because I was tired” or “I was just thinking of something else”. Confident people listen to criticism and see whether it's true or not.____ However, if they know it's not true, they don't care much about it.

    Becoming a perfectionist. A perfectionist thinks that he lives in a perfect world so he tries to do everything perfectly.____ Confident people are not perfectionists. If they get a “B”, they may try to get an “A” next time, but if they get 99/100, they won't be unhappy about not getting a full mark because they know they're not perfect.

A. Confident people don't give reasons for their actions.

B. Read the following information and you'll know the answer.

C. Accepting criticism immediately.

D. Replying back immediately to criticism.

E. If the criticism is true and can help them, they accept it.

F. He may become very unhappy if he gets 99/100 in an exam.

G. He may become very unhappy if he can't pass the exam.