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等价分类法的基本思想是什么？
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在对三维模型进行操作时下列说法错误的是（）。
Dubin-Johnson综合征属于（）
病毒性心肌炎的发病内因是（）
60001次是（）。
Write two letters on acceptance and refusal to the following claim letter respectively for the exporter after reading the following letter.Dear Sirs, We refer to sales contract No．508 covering the purchase of 200 metric tons of white cement. We telexed you on 17May informing you that the consignment arrived on 20 April. On inspection, we found that 180 bags had burst and that the contents, estimated at 9000kg, had been irretrievably lost. We proceeded to have a survey report made．The report has now confirmed our initial findings．The report indicates that the loss was due to the use of substandard bags for which you, the suppliers, are responsible. On the strength of the survey report, we hereby register our claim against you as follows: Short delivered quantity GB￡180 Survey charges GB￡50 Total claimed GB￡230 We enclose survey report No．TS6478 and look forward to early settlement of the claim.Yours faithfully,
60SizMn表示该钢的平均含碳量为（），平均含硅量为（），平均含锰量为小于（）。
隐成本
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人体血糖稳压系统，主要起作用的是（）
一足月顺产儿，女性。以母乳喂养。生后24h黄疸明显，血清胆红素212μmol／L，母血型O，Rh（+）。下列检查哪项首选（）