dismissal;exclusion from school;expulsion

Some methods for stripping bad deposits were introduced,including chemical and electrolytic stripping of bad copper (alloy) and nickel deposits on steel substrates,chemical and electrolytic stripping of bad nickel deposits on copper (alloy) substrates,and stripping of bad Ni–Fe alloy deposits.

介绍了几种退除不良镀层的方法,包括钢铁件上不良铜及铜合金镀层、镍层的化学和电解退除法,铜及铜合金件上不良镍层的化学和电解退除法,不良镍铁合金镀层的退除法。