题目内容

到战国时期，人们利用磁石的指极性用____磨成勺形，把它放在特别光滑的盘子上，用以指南，称为司南。

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毕昇的印书方法虽然十分原始，但是活字印刷的三个主要步骤：____、排版和印刷都已经具备，他比德国人约翰内斯·古腾堡发明的活字印刷术早了约400年。

《墨经》中阐述了影、小孔成像、平面镜、凹面镜、凸面镜成像，还说明了____和物体成像的关系，这些比古希腊欧几里德（约公元前330～275）的光学记载早百余年。

信用证的基本当事人有哪些？（注：中英文）

翻译信用证流程：a. The importer applies to a local bank foropening an L/C in favour of the exporter and provides a certain amount ofdeposit and formality fees.b.The opening bank sends the L/C opened to the advising bank.c. The advising bank transfer theL/C tothe exporter.d. After examining the L/C, the exporter delivers the goods according to the stipulations of L/C. After shipment, the exporter makes out a draft, and draws up the documents inaccordance with the L/C, and delivers them to the negotiating bank within itsvalidity.e. If the documents are in conformitywith the L/C, the negotiating bank will advance the purchase price to the exporter.f. The negotiating bank transfers thedraft and documents to the opening bank or the bank appointed by the openingbank applying for payment.g. The opening bank will pay to the negotiating bank after examining the documents.h. The opening bank informs the applicant of the same and asks him to make payment so as to get hold of the shipping documents.i. The applicant makes payment to gethold to shipping documents, and take delivery of the goods against the documents.