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【背景材料】甲、乙两公司拟签订一份10台A型号挖掘机的买卖合同，甲为卖方，乙为买方。

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【背景材料】甲、乙两公司拟签订一份10台A型号挖掘机的买卖合同，甲为卖方，乙为买方。在签订合同时甲要求丙公司为乙付款提供保证，当乙不能付款时，由丙承担连带偿付货款的责任。考虑到乙经营情况良好，丙同意提供保证并与甲签订了书面保证合同。甲、乙两公司的货物买卖合同签订后，甲以不能全部提供A型号挖掘机为由，与乙协商一致改为提供10台B型号挖掘机。甲、乙双方达成改变合同标的物协议，未经丙同意。甲在约定的供货时间内只能提供6台B型号挖掘机。甲未经乙同意，与丁公司达成协议，另外4台B型号挖掘机由丁向乙提供。甲、丁向乙提供了全部10台B型号挖掘机，但超过了甲乙约定的供货期限。乙虽接受了货物，但以甲、丁未按期履行供货义务为由，行使后履行一方的抗辩权，拒绝履行付款义务。甲遂诉至人民法院，请求判令丙偿还货款。

甲、丁两公司达成的提供货物协议是否有效？为什么？

答案：

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                                                        From Paragraph to Essay
     Of particular relevance to students who wish to improve their organizational skills and who feel that
their final product is never clear enough. 
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     How do you gather information for a project or paper?A practical course which looks at sources of
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                                                                                                                      Monday10:00-11:00 
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                                                            Express Yourself
     An advanced course suitable for students who are about to step into organizations where they may have
to voice their opinions often.
                                                                                                                       Monday 12: 00-2: 00
                                                                                                                       Dave Parrin
                                                        Dave Parrin Media Use
     Open to all students, this course focuses on many ways we can bene fit from the radio and television.
Group Projects form part o f course.
                                                                                                                      Tuesday 9: 00-11: 00
                                                                                                                      Steve Ansell
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     A research into the world o,popular writers. One story is selected for adaptation into a short play and
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     Open to all students. Simple eye exercises to help you with speed reading. How to be selective on the
page. Using headings,topic sentences and paragraphs for easy access.
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