An A. C. voltage of 2000 volts is applied between the winding and ground to test the integrity of the insulation between the winding and coreiron.
在线圈绕组和地线上加上200 0伏交流电以测试线圈绕组和芯铁之间的绝缘的整体性能。
2
In theory, you need molten iron in the core to generate one, but Mercury is so small, its core should have long since solidified.
理论上,你需要核心里的熔化铁来产生它,但是水星很小,它的核心凝固还要很久。
3
But, unlike the cores of the inner planets, the Moon's core contains little or no iron, while the typical planet-forming materials were quite rich in iron.