这个厂的合同制工人都曾担心“纸饭碗”不牢靠。

All contract workers worry about the insecurity of their "paper rice bowl".

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介绍炼厂酸性气制硫酸装置的工艺过程。

Process of sulphuric acid production from refinery acid gas is described.

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介绍炼厂酸性气制硫酸装置的工艺过程。

Process of sulphuric acid production from refinery acid gas is described.

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