题目内容

电阻率也称电阻系数,它指某种导体做成长1米,横截面积1平方毫米的导体,在温度20℃时的电阻值。

A. 对
B. 错

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电阻与导线长度L成正比,与导线横截面积反比。

A. 对
B. 错

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电阻R1=160Ω,R2=40Ω,两者串联后,在其两端加200V电压时,R2上的压降等于40V。

A. 对
B. 错

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Exercise 1Directions: You will hear an interview of Chinese astronauts. Choose the best answer to each question.1.Which of the following statement is false?

A. It’s difficult to dock two space crafts together
B. Astronauts should do simulations many times before docking
C. Astronauts should practice two years before docking
D. Astronauts should practice two hours before docking

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2. Which of the following is not included in the training of astronauts?

A. Cross training.
B. Physical training.
C. Psychological training.
D. Team testing.

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电阻率也称电阻系数,它指某种导体做成长1米,横截面积1平方毫米的导体,在温度20℃时的电阻值。

A. 对 B. 错

电阻与导线长度L成正比,与导线横截面积反比。

电阻R1=160Ω,R2=40Ω,两者串联后,在其两端加200V电压时,R2上的压降等于40V。

Exercise 1Directions: You will hear an interview of Chinese astronauts. Choose the best answer to each question.1.Which of the following statement is false?

2. Which of the following is not included in the training of astronauts?

A. 对
B. 错