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阅读理解B ：Below are search record from a university library’s database 阅读理解：B Below are search record from a university library’s database Quick Search l Category l Full Text l Advanced Search full text books for children Displaying 1 to 100 of 639 titles for children where Category is Education 46.Suppose you are doing research on children’s relationship skills,you may want to read . A.Circle Time for Young Children B. Children with School Problems:A Phsysician’s Manual C.Education and Disaddvantaged Children and Young People D.Build It,Make It,Do It,Play It!Guides for Children and Teens 47.Which book would you recommend to someone interesten in children’s mental imanges? A.Connecting Animals and Children in Early Childhood. B.Songs in Their Heads:Music and Its Meaning in children’sLives. C.Big Ideas for Little Kids: Teaching Philosophy Through children’s Literature. D.Young Children as Artists:Art and Design in the Early Years and Key Stage 1. 48.How many books published in 2015 are found in this search? A. 9. B.90. C.118. D.290. 49. Children with School Problems:A Phsysician’s Manua lis most likely intended for . A. educators B. librarians C. doctors D.artists
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【单选题】方程【图片】的根是：
A.
-3136.8802646094085486049494182046
B.
0.30788613434117282479220720516111
C.
2.30788613434117282479220720516111
D.
1.60788613434117282479220720516111
【简答题】按我国供电质量标准，对用户受电端的电压变动幅度，（）用户为额定电压的+5%和-10%。
【单选题】我国引用国际上有关标准，制定了用户流入电网的谐波电流允许值和电网电压正弦波形畸变极限值，如对于380V电网，电压允许畸变率为（ ）。
A.
1%
B.
2%
C.
5%
D.
10%
【单选题】我国国家标准规定:电网正常运行时,对接于公共连接点的每个用户引起该点负序电压不平衡度允许值一般为()%,短时不超过()%。
A.
2；4
B.
1.3；2
C.
1.3；2.6
D.
2；2.6
【单选题】用简单迭代法求方程【图片】的实根，其本质是把方程f【图片】表示成【图片】，则【图片】的根是?
A.
与x 轴交点的横坐标
B.
与 交点的横坐标
C.
与 轴的交点的横坐标
D.
与 的交点
【简答题】按我国供电质量标准，规定用户受电端的电压变动幅度，低压照明用户为额定电压的（）和（）。
【判断题】对于二阶常系数非齐次线性方程【图片】，若【图片】不是特征方程【图片】的根，则原方程的特解形式为【图片】，其中【图片】和【图片】均为次数不超过【图片】的多项式，【图片】．
A.
正确
B.
错误
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