Nickel underplating prevents the migration between tin or gold platings and the base material.
垫板镀镍可防止在镀锡或金层与基料之间的
。
, 居;民;的;
;居者;居者;民局检查站;行速
；迁速
据迁；资料转率；迁徙率；迁速算法行Nickel underplating prevents the migration between tin or gold platings and the base material.
垫板镀镍可防止在镀锡或金层与基料之间的。
Swallows begin their migration south in autumn.
燕子在秋季开始向南方迁。
A general method of data migration between heteroid databases was discussed subsequently.
其次讨论了异构据库间据迁的一般方法。
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