Drag onto the page. the longer line represents the positive pole.
拖到绘图页上。较长的线代表正极。
The longer line represents the positive pole .
较长的线代表正极。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole .
这个效应表明，有一种垂直于圈平面的力作用在磁极上。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole.
一根磁针的磁极作用，无论正负都是一样的真实。
Congratulate the South pole investigation term returns in triumph, positive our flowmeters complete mission successfully.
热烈祝贺南极考察团凯旋而归，正博二十几套涡街流量计圆满完成任务。
Congratulate the South pole investigation term returns in triumph, positive our flowmeters complete mission successfully.
热烈祝贺南极考察团凯旋而归，正博二十几套涡街流量计圆满完成任务。
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