承制单位往往采取提出询问、质疑与投诉的方式，维护自身合法权益。

The equipment suppliers always inquire, suspect and indict to assert their lawful behalf.

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引言部分，旨在界定质疑与投诉制度的基本范畴，显现对其加以研究的立法背景、理论价值以及实践意义。

In the Preface, it aims to define the basic categories of the challenge and complaint system, presenting the legislative background, theoretic value and practice importance of studying them.

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