accordance with the agreement and accept the inspec on of the client. Ar cle 775 Where a client is to provide the materials, he shall provide the materials in accordance with the agreement. The contractor shall promptly inspect the materials provided by the client, and, if any inconformity is found, the contractor shall promptly request the client to make replacement, make up the shortage or take other remedial measures. Without the consent of the client, a contractor may not change the materials provided by the client nor change the accessories and parts which do not need repair. Ar cle 776 A contractor shall promptly no fy the client if he nds that the drawings or technical requirements provided by the client are unreasonable. Where losses are caused to the contractor due to the client's failure to response or the like reasons, the client shall bear the liability for compensa on. Ar cle 777 Where, in the course of a contracted work, the client changes his requirements, thus causing loss to the contractor, the client shall bear liability for compensa on. Ar cle 778 Where a contracted work requires assistance from the client, the client has the obliga on to provide such assistance. Where the client fails to perform such obliga on, thus making the comple on of the contracted work impossible, the contractor may demand him to perform his obliga on within a reasonable period of me, and may also extend the term of performance accordingly. If the client s ll fails to ful ll his obliga on within the extend term, the contractor may rescind the contract. Ar cle 779 A contractor shall accept necessary supervision and inspec on of the client in the course of his work. The client may not disturb the normal work of the contractor by such supervision and inspec on. Ar cle 780 Upon comple on of his work, a contractor shall deliver to the client the work product and provide the client with the necessary technical materials and related quality cer cates. The client shall inspect the work product for acceptance. Ar cle 781 Where the work product delivered by the contractor fails to meet the quality requirements, the client may, in a reasonable manner, request the contractor to bear default liability in forms of repair, reworking, remunera on reduc on, or compensa on for losses. Ar cle 782 A client shall pay remunera on within the me limit agreed by the par es. Where there is no agreement between the par es on the me limit for paying remunera on or the agreement is unclear, if it cannot be determined according to the provisions of Ar cle 510 of this Code, the client shall make payment at the me of delivery of the work product; and where part of the work product is delivered, the client shall pay the corresponding remunera on. Ar cle 783 Where a client fails to make such payments as remunera on or materials fees, the contractor has the right to retain the work product under lien or to refuse delivery, unless otherwise agreed by the par es. Ar cle 784 A contractor shall properly keep the materials provided by the client and the completed work product, and shall bear the liability for compensa on if such materials or the work product are destructed, damaged or lost owing to his inappropriate maintenance thereof. Ar cle 785 A contractor shall keep con den al the relevant informa on in accordance with the requirements of the client and, without the la er's permission, may not retain copies or technical data thereof. Ar cle 786 Co-contractors shall bear joint and several liabili es to the client, unless otherwise agreed by the par es. Ar cle 787 The client may rescind the work contract at any me before the contractor completes his work, ti fi ti ti ti ti ti ti ti fi ti ti ti ti ti ti fi ti ti ti ti ti ti ti ti ti ti ti ti fi ti tt ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti 84