〔案例介绍〕笔者在工作中遇见这么一件事情。笔者所在地区的一家建筑公司与外地一家水泥厂签订了一份水泥购销合同。合同条款规定全面、详尽，且还进行了公证。合同签订后，水泥厂按合同规定及时交付了水泥。建筑公司接货后支付了部分货款，但尚欠４万元货款未付。此后水... [Case Introduction] I met in the work of such a thing. A construction company in the area where the author is located has signed a cement purchase and sales contract with a cement factory in the field. The terms of the contract are comprehensive and detailed, and notarisation is also carried out. After the contract was signed, the cement factory delivered the cement in time according to the contract. After the construction company paid some of the purchase price, but still owed 40,000 yuan unpaid. After water ...