民用照明电路电压是以下哪种?()A.直流电压220伏 B.交流电压280伏 C.交流

题型:单项选择题

问题:

民用照明电路电压是以下哪种?()

A.直流电压220伏

B.交流电压280伏

C.交流电压220伏

D.直流电压280伏

考点:高校实验室安全考试电气电气题库
题型:单项选择题
任务型阅读。阅读短文,然后按要求完成1-5小题。
      As we know, Xiao Shenyang and Liu Qian did wonderful jobs in the CCTV Spring Festival Gala. Now many
people are crazy about these two persons. But how much do you know about them? 
      Xiao Shenyang was born in a poor peasant family which is in difficult family conditions. His real name is
Shen He. He is an actor. He is good at Er Ren Zhuan. He learned acts, following Zhao Benshan. During the
school life, he was very active in many activities. He looks like a simple man, but he never stops pursuing (追求)
his artistic aspiration (渴望). More and more people like his style of performance, and we hope he can make
great progress in the future.
      Liu Qian is a young magician from Taiwan. At the age of 7, Liu saw a cute magic toy in a shop. At that
moment he began to love and decided to learn magic. Liu didn't go to any magic school. He practiced tricks
every day to improve his skills, until one day he was able to put on a show for his class. He saw the surprise
on everyone's face, and he felt it was cool. He often does street shows for passers-by, police and farmers. He
worked hard at it. Now he is a famous magician.
任务:请阅读这篇短文,根据短文内容完成下面表格中关于小沈阳和刘谦的信息。
Xiao Shenyang                        Liu Qian
Job An actor A young 3._________ from Taiwan
How to succeed He learned acts, following Zhao
Benshan.During the school life,
he 1. _________. He looks like
2._________. But he never
stops pursuing the artistic
aspiration.
He always learned magic 4._________
at the beginning. At his show for his class,
he found everyone 5._________ and he felt it
was cool. He often does street shows for people.
He works hard at it.
题型:单项选择题

以下不是智齿冠周炎常见原因的是 ()

A.牙齿阻生

B.牙龈盲袋形成

C.机械压力

D.牙髓炎

E.细菌侵入

题型:单项选择题

立方根等于本身的数是______;实数内因式分a4-6a2-7=______.

题型:单项选择题

为了纪念物理学家的杰出贡献,常以他们的名字命名物理量的单位。如:以安培命名电流的单位,以_________命名_________的单位。

题型:单项选择题

口腔颌面部外伤后组织容易肿胀是因为()

A.血运丰富易形成血肿

B.颌面部创伤一般较严重

C.颌面部咀嚼运动多

D.口腔颌面部腔窦多

E.颌面部有腮腺组织

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