一本好书开卷引人入胜，掩卷使人获益。

There is a good book which is opened with expectation and closed with profit.

一部好书，开卷则引人入胜，掩卷则让人获益。

That is a good book which is opened with expectation and closed with profit.

介绍了配洗连轧线开卷机的自动电流控制和自动速度控制模式。

The automatic current control and speed control of decoiler in pickling and cold rolling line are introduced.