The retention of data in a storage device.
数据保存在存储设备中的现象。
The utility model relates to an electricity-saving device of an electromagnet, which carries out retention by alternating current.
本实用新型涉及一种以交流吸持的电磁铁之节电装置。
Intrauterine device (IUD); Perimenopausal period; Retention; Safety.
宫内节育器；围绝经期；滞留；安全性。
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