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【判断题】
在实际电网中使用的大容量的电气设备三相的阻抗一般都是对称的,因此,实际应用总高压输电线路一般都采用三相三线制。A.
正确
B.
错误
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【单选题】使用原子吸收分光光度计测定食品中锌含量,在进行样品测量前,应先对仪器工作条件进行最佳化选择,原则是使测试溶液有较大的吸光度和较好的()
A.
折光性
B.
均匀性
C.
稳定性
D.
透明性
【单选题】Read the introduction [paragraphs 1-5]. Select the paragraph that explains HOW the pigeons became famous?
A.
During the week of December 2, Bobby Lee saw a few pigeons walking around in a parking lot. He was on his way to a store in Las Vegas, Nevada. These were not ordinary pigeons. The birds were wearing little cowboy hats.
B.
One bird wore a red hat and one wore a gray one. Lee posted a video of the birds online. The video got very popular. Now people want to know who dressed up the birds.
C.
"It got a lot of attention fast," said Lee. He is 26 years old. He said the next day, people who work in the news wanted to buy his video.
D.
Mariah Hillman works for a pigeon rescue group in Las Vegas. It is called Lofty Hopes. She and her daughter looked for the pigeons after seeing the video. They walked around where the birds were seen. They asked people to call them if they saw the pigeons.
【简答题】____是世界冶金铸造史上最早的合金。
【简答题】要求制作个人网站,内容要积极健康,要求6月26日晚上23:59前提交。
相关题目：
【单选题】使用原子吸收分光光度计测定食品中锌含量,在进行样品测量前,应先对仪器工作条件进行最佳化选择,原则是使测试溶液有较大的吸光度和较好的()
A.
折光性
B.
均匀性
C.
稳定性
D.
透明性