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【简答题】
将长度为 20cm 、通有 O . 1A 电流的直导线放入一磁场中,电流与磁场的图所示.已知磁感应强度为 1T ,试求下列各图中导线所受的大小 。
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参考答案：
举一反三
【单选题】在相同的条件下，在输电线路的同一点发生三相或两相短路时，保护安装处母线相间的残压（ ）。
A.
(A)相同
B.
(B)不同
C.
(C)两相短路残压高于三相短路
D.
(D)三相短路残压高于两相短路
查看完整题目与答案
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )。
A.
相同;
B.
两相短路残压高于三相短路;
C.
不同;
D.
三相短路残压高于两相短路。
查看完整题目与答案
【判断题】在同等的条件下,当输电线路同一点发生三相或两相短路时,保护安装处母线间的残压相同。
A.
正确
B.
错误
查看完整题目与答案
【判断题】目前新疆农业生产上最常用的化肥是尿素和二铵。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )
A.
相同
B.
不同
C.
两相短路残压高于三相短路
D.
三相短路残压高于两相短路
查看完整题目与答案
【单选题】The figure shows a bar moving to the right on two conducting rails. To make an induced current i in the direction indicated, a constant magnetic field in region A should be in what direction?
A.
Into the page
B.
Out of the page
C.
Left
D.
Right
查看完整题目与答案
【简答题】(Figure: Bicycles and Radishes I) The figure shows production possibility frontier for two countries that produce only radishes and bicycles. The axes of both graphs are measured in equivalent units. ...
查看完整题目与答案
【单选题】以下关于字符串的叙述中正确的是
A.
C语言中有字符串类型的常量和变量
B.
两个字符串中的字符个数相同时才能进行字符串大小的比较
C.
可以用关系运算符对字符串的大小进行比较
D.
空串一定比空格打头的字符串小
查看完整题目与答案
【单选题】智能蔬菜种植箱可以自动调节箱内的温度与光照,并能自动浇水,实现这些功能通常不会用到的传感器是______
A.
温度传感器
B.
光线传感器
C.
湿度传感器
D.
红外传感器
查看完整题目与答案
【单选题】The figure shows the employment rates of 20- to 24-year-olds in the U.S., by sex and educational attainment in 2016. Answer the question according to the information in the figure. Which of the follow...
A.
The employment rate is higher for young adults with higher levels of educational attainment than for those with lower levels of educational attainment.
B.
The difference between the employment rates for females and males becomes larger with the increase in educational attainment.
C.
For females, the employment rate without completing high school is more than two times lower compared with the rate for those with a bachelor's or higher degree.
D.
among young adults, employment rates are higher for males than for females at each level of educational attainment.
查看完整题目与答案
相关题目：
【单选题】在相同的条件下，在输电线路的同一点发生三相或两相短路时，保护安装处母线相间的残压（ ）。
A.
(A)相同
B.
(B)不同
C.
(C)两相短路残压高于三相短路
D.
(D)三相短路残压高于两相短路
查看完整题目与答案
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )。
A.
相同;
B.
两相短路残压高于三相短路;
C.
不同;
D.
三相短路残压高于两相短路。
查看完整题目与答案
【判断题】在同等的条件下,当输电线路同一点发生三相或两相短路时,保护安装处母线间的残压相同。
A.
正确
B.
错误
查看完整题目与答案
【判断题】目前新疆农业生产上最常用的化肥是尿素和二铵。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )
A.
相同
B.
不同
C.
两相短路残压高于三相短路
D.
三相短路残压高于两相短路
查看完整题目与答案
【单选题】The figure shows a bar moving to the right on two conducting rails. To make an induced current i in the direction indicated, a constant magnetic field in region A should be in what direction?
A.
Into the page
B.
Out of the page
C.
Left
D.
Right
查看完整题目与答案
【简答题】(Figure: Bicycles and Radishes I) The figure shows production possibility frontier for two countries that produce only radishes and bicycles. The axes of both graphs are measured in equivalent units. ...
查看完整题目与答案
【单选题】以下关于字符串的叙述中正确的是
A.
C语言中有字符串类型的常量和变量
B.
两个字符串中的字符个数相同时才能进行字符串大小的比较
C.
可以用关系运算符对字符串的大小进行比较
D.
空串一定比空格打头的字符串小
查看完整题目与答案
【单选题】智能蔬菜种植箱可以自动调节箱内的温度与光照,并能自动浇水,实现这些功能通常不会用到的传感器是______
A.
温度传感器
B.
光线传感器
C.
湿度传感器
D.
红外传感器
查看完整题目与答案
【单选题】The figure shows the employment rates of 20- to 24-year-olds in the U.S., by sex and educational attainment in 2016. Answer the question according to the information in the figure. Which of the follow...
A.
The employment rate is higher for young adults with higher levels of educational attainment than for those with lower levels of educational attainment.
B.
The difference between the employment rates for females and males becomes larger with the increase in educational attainment.
C.
For females, the employment rate without completing high school is more than two times lower compared with the rate for those with a bachelor's or higher degree.
D.
among young adults, employment rates are higher for males than for females at each level of educational attainment.
查看完整题目与答案
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