Reluctometer
磁阻签质仪(检查钢制品质量)
🗣️ 情景例句
I like it there.
摆在那里很好。
John is really scared of airplanes.
约翰真的很怕乘坐飞机。
it was not long before its use as the uniquely recognizable broadcasting frequency for interstellar communication was suggested.
提出把它作为星际间唯一可辨认的广播频率就为期不远了。