问题 单项选择题 案例分析题

某发电厂装有两台300MW机组,经主变升压至220kV配电装置,屋外配电装置母线采用支持式管型母线,为双母线接线分相中型布置,母线采用φ120/110铝锰合金管,母联间隔跨线采用架空软导线。

母联间隔有一跨跳线,请计算跳线的最大摇摆弧垂的推荐值为下列哪项值?()(导线悬挂点至梁底6为20cm,最大风偏时耐张线夹至绝缘子串悬挂点的垂直距离f为65cm,最大风偏时的跳线与垂直线之间的夹角为45°,跳线在无风时的垂直弧垂F为180cm),详见图。

A.135cm

B.148.5cm

C.190.9cm

D.210cm

答案

参考答案:D

选择题
阅读理解

B

Today, robots come in all shapes and sizes. They can’t complain, even if the work is heavy and dangerous. And they can work or play all day without getting bored. Unlike a human’s arms, a robot’s joints will never get stiff (僵硬的). The end of the arm can be fitted with devices (装置) to perform different tasks. These could be a welding (焊接) point, suction cups (吸附杯) or gripping fingers (钳形指) for lifting and moving objects. Such an arm of these computer controlled industrial robots can work 24 hours a day.

Robopets (机器人宠物) are high-tech robots programmed to play. They can communicate with their owners and recognize their voices. Each one will develop a different “personality”. They can be a lot of fun to play with, but these robots can also be helpful to people who are sick and can’t look after a real animal. Many doctors believe that when a person is happy and laughing, their body recovers faster. A robopet might be just what the doctor ordered.

NeCoRo is a robot cat that has been developed to be more than a toy. The robot uses sensors (传感器) that can detect movement and sound. It can even store helpful information in its memory. Its behaviour changes over time, just like a real pet.

60. From Paragraph 1 we learn that ________.

A. a human’s arms never get stiff

B. robots sometimes get bored just as humans do

C. robots can do some work which humans can’t

D. robots can work all day but they can’t play

61. Rob pets are especially useful in ________according to the passage.

A. schools                 B. Hospitals       C. cinemas             D. factories

62. Which of the following is NOT true according to the passage?

A. A robot never says “NO” to the dangerous work.

B. A robot can “remember” useful information.

C. NeCoRo is a robot dog.

D. NeCoRo’s behaviour changes over time.

63. What does the underlined word “detect” in Paragraph 3 mean?

A. Recognize.         B. Create.          C. Store.                D. Destroy.