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有机化学是研究有机化合物及化学原理的一门学科。它包含了对碳氢化合物及其衍生物的组成、结构、性质、反应及制备的研究。()
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水体中含有各种金属，它们中有些是人体必需的，而另一些是有害的，分析这些金属的浓度，以判断是否符合用水安全。按照金属在水中的存在形式，可分的类别数为（）
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对于不符合工程勘察要求的项目，必须填写（）。
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关于国际合作的叙述，正确的是（）
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民用爆炸物品最小计数单位和基本包装单元上应同时有（）和登记标识。
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男，37岁，发热、头痛6天，无尿2天入院，入院时神志清，结合膜充血、水肿，皮肤有瘀点、瘀斑，血压130／90mmHg，血象：Hb110g／L，WBC38.0×109/L，异型淋巴细胞0.15，PLT42.0×109/L。尿蛋白+++，住院第2天突然出现失语，左侧肢体偏瘫，抽搐、昏迷，血压180／120mmHg，左侧巴氏征阳性，经积极抢救无效死亡，下列哪项诊断可能性大（）
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下列关于初始权属调查通知的表述错误的是（）。
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成本管理可分为两个阶段：计划成本的编制阶段和计划成本的实施阶段
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要从磁盘上新建一个文件名为"C:\t1.txt"的顺序文件，正确的语句是( )。
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Complaints caused by not delivering according to the time and quantity In the fall of 2006 ,one of our trading companies concluded a substantial rice business with an old customer in Africa. The terms of delivery are : shipment is to be made in equal monthly lots beginning from December,2006 to June,2007 and payment is to be made by irrevocable letter of credit 60 days after the date of the bill of lading. The customer established the L/C in time and all particulars of the rice, such as the name , specifications , unit price,total price and total quantity are in conformity with the contract. But the terms of shipment only stated " the latest date of shipment is June 30 ,to be shipped in several lots". The staff in our trading company made the first shipment in December according to the quantity stated in the contract. However in order to export more and eam more foreign exchange earlier, they advanced the time of shipment regardless the shipment terms stipulated in the contract. In January 2007 , our company shipped the quantity of the first quarter once , and in February made the third shipment for the rest quantity that should be delivered in the second quarter, since our staff had not found any specifications "shipment is to be made in equal lots" in the L/C. At the same time our bank negotiated against presentation of the stipulated documents and subsequently asked the opening bank to pay for the goods. The opening bank examined the L/C and confirmed that the L/C had no error in it. After receiving the shipping advice, the African customer found that the delivered quantity of the rice both in the second lot and third lot were not in accordance with the shipment terms stipulated in the contract, so a claim was filed by the customer against our trading company for default shipment. The amount claimed involved the added fees of chartering warehouse for the delivered goods, the interest and other charges etc. The two parties negotiated the compensation for several times, finally our company accepted the opposing party's opinion and agreed that the purchase price for the last two lots was to be paid four months later, that meant our company would receive the payment a few months later than che original stated time. According to Lhe current price in the international market at that time, our trading company suffered the loss equivalent to 10 percent of the original selling price. Questions : (1) What is the relationship between the letter of credit and the transaction contract? (2) Which proof must the two parties concerned base on when they perform their obligations? (Translate the case into Chinese and then answer the question) Helpful hint: It is stipulated in Article 4 of the Uniform Customs and Practice for Documentary Credits that "in credit operations all parties concerned deal in documents and not in goods , service and/or other performance to which the documents may relate" .