使用1000V兆欧表进行测试,断路器分、合闸线圈绝缘性能应符合产品技术条件且不低于( 发布时间:2018-04-01 23:28 │ 来源:www.tikuol.com 题型:单项选择题 问题: 使用1000V兆欧表进行测试,断路器分、合闸线圈绝缘性能应符合产品技术条件且不低于()MΩ。A.1B.5C.10D.15
题型:单项选择题 阅读理解。 把A-D四个句子填入文中空缺(1-4),使短文内容完整、正确,然后完成第5小题。 Mona has an interesting hobby. She collects stamps. She spends a lot of time on her stamp collection after school hours. 1 They are all in color. Mona likes stamps with pictures of animals and birds on them. 2 She also borrows books on animals and birds from her school library. She learns many things about them. Sometimes Mona has many stamps of the same kind. She gives them to her classmates. 3 Mona writes to her friends in many countries. 4 In return,they send her stamps of their countries. Mona’s father also gives her stamps. He brings them home from his office for her and he often enjoys the stamps with her. But Mona’s mother never gives her stamps because she thinks spending too much time on it is bad for study. Many of Mona’s friends collect other things. Some collect coins and others collect matchboxes(火柴盒). But, all of them say that Mona’s collection is the most interesting of all.* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * A. They give her other stamps in return.B. She has collected hundreds of stamps from all over the world. C. She sends them stamps of her country.D. In this way, she learns the names of many animals and birds.5.Which of the following sentences is NOT true?A. Mona spends much time on her hobby when she is free.B. From the passage, we know Mona likes animals and birds.C. Mona gets stamps from her classmates, friends and her parent.D. Of all the collections, stamps are the most popular. 查看答案
题型:单项选择题 根据右表所提供的数据(1标准大气压下)可知:(1)0℃的水银是 态;(2)在北方寒冷的季节里,最低气温可达一50℃,此时应选用 (选填“酒精”或“水银”)做温度计的测温液体.(3)体温计是根据液体的_____________性质制成的。使用时,它______(选填“可以”或“不可以”)离开人体读数。 查看答案