常用的二次接线图有哪些种类?
参考答案:
常用二次接线图有原理接线图、展开接线图和安装接线图等三种。
右图是古代某一时期行政区划局部地图,根据图中信息判断该历史地图最可能是
A.周朝
B.秦朝
C.宋朝
D.元朝
According to the speaker, the proportion of college students with loans in the United States has increased from 50% in 1993 to about 67% at present and the average loan debt when they graduate is 17,000 dollars.