There are a series of problems in batch production of plating chromium for lining inner bores of input tube in oil well pump such as parameter choice, clamp design, bath care and adjust.

油井抽油泵输入泵衬套内孔尺寸镀铬批量生产中存在着工艺参数准确选择、夹具合理设计、槽液维护和调整等一系列问题。

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Bath formulas of blackening pretreatment and manganese series phosphating at mid-temperature were introduced.

介绍了预黑处理液配方和中温锰系磷化液配方。

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It is proved through experiments that the stability of the acid bath has been greatly improved after adding the series of TUM additives in it.

实验结果表明，在酸性镀液中加入TUM系列添加剂可以明显改善镀液的稳定性。

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He soon added a penalty and then slid home the stiletto with a try of his own, finishing off the latest in a series of a marvellous Bath attacks that saw backs and forwards interchanging at will.

BBC: Wasps 19-35 Bath

The first of a series of 20mph speed zones in residential areas of Bath have come into force.

BBC: Speed limit of 20mph in Twerton and Southdown

Stretching 15 miles down the river valley from Matlock Bath to Derby, the World Heritage Site contains a fascinating series of historic mill complexes, including some of the world's first 'modern' factories.

UNESCO: World Heritage