直流电机电枢绕组的作用是什么?
参考答案:
电机电枢绕组的作用是产生感应电势和通过电流产生电磁转矩,实现机电能量转换。
属于Internet业务种类的有()。
A、电子邮件(E-mail)传递
B、文件传输服务(FTP)
C、数据库的检索
D、网络信息查询服务
In the figure above, line segments JK and LM represent two positions of the same board leaning against the side KN of a wall. The length of KN is how much greater than the length of MN (1) The length of LN is
meters. (2) The length of JN is 1 meter.