债权人有权向连带责任人中一人、数人或全体，同时或先后请求履行全部或一部分债务。
A creditor is endowed with the right to request simultaneously or one or several of the debtors to discharge total or part of the debt in turns.
作为履行监理合同的第一责任人，项目总监的业务素质水平在很大程度上决定着监理工作的最终成败。
As the first person to perform supervision contract, the working effect is depends on vocational level of the chief-supervisor closely.
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