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简答题 某低压配电室内,成排配电柜的前后通道间距过小、出口位置不合理、采暖系统采用丝扣连接、配电室上层是多水场所等,影响配电系统的正常运行,给维修带来不便,造成不安全的隐患。 为防止上述现象发生,应采取哪些防护措施

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三相变压器的基本原理和单相变压器的原理是不一样的。( )

A. 对
B. 错

压气式高压复合开关的特点是压气活塞与动触头联动,压缩空气吹弧,开断能力较强,能频繁操作,但断口电压较低。( )

A. 对
B. 错

[听力原文]8-10M: It’ s a beautiful day, isn’ t itW: Yes, nice and sunny.M: It’s much better than last week. It was too warm then.W: I’m glad summer is over. I like autumn best.M: So do I. It’s neither too hot nor too cold. The sky is clear and blue.W: It’s a good time to have a picnic. Do you want to have one this weekendM: I’d love to, but I think it’s going to rain.The weatherman said it will.W: I don’t think he’s right. It hasn’t rained for a week.M: But he is usually right in his weather news.W: I’m sure we’ll have fine weather for our picnic. What does the woman think the weather will be like this weekend()

A. She thinks it’ll rain.
B. She doesn’t think it’ll rain.
C. She thinks it’ll be cloudy.
D. She doesn’t think it’ll be fine.

TEXT A There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to give children something to do. In the ancient world, as is today, most boys played with some kinds of toys and most girls with others. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world. What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of craftsmanship, mechanics, and technology. It is the universality of toys with regard to their development in all parts of the world and their persistence to the present that is amazing. In Egypt, the Americas, China, Japan and among the Arctic peoples, generally the same kinds of toys appeared. Variations depended on local customs and ways of life because toys imitate their surroundings. Nearly every civilization had dolls, little weapons, toy soldiers, tiny animals and vehicles. Because toys can be generally regarded as a kind of art form, they have not been subject to technological leaps that characterize inventions for adult use. The progress from the wheel to the oxcart to the automobile is a direct line of ascent. The progress from a rattle used by a baby in 3000 BC to one used by an infant today, however, is not characterized by inventiveness. Each rattle is the product of the artistic tastes of the times and subject to the limitations of available materials. Which of the following is the author’s view on the historical development of toys

A. The craftsmanship in toy-making has remained essentially unchanged.
B. Toys have remained basically the same all through the centuries.
C. The toy industry has witnessed great leaps in technology in recent years.
D. Toys are playing an increasingly important role in shaping a child’s character.

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