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。
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.
在秋季开始向南方迁
。
A general method of data migration between heteroid databases was discussed subsequently.
其次讨论了异构数据库间数据迁的一般方法。
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