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.
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.
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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