单项选择题

预应力混凝土的材料一般采用
A、高强钢筋，高强混凝土
B、普通钢筋，高强混凝土
C、高强钢筋，普通混凝土
D、普通钢筋，普通混凝土

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外板展开图表达的主要内容是什么？

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Unless otherwise stipulated in the Credit，banks will accept an insurance certificate or a declaration under an open cover presigned by insurance companies or under writers or their agents．If a credit specifically calls for an insurance certificate or a declaration under an open cover，banks will accept，in lieu there of，an insurance policy． Unless otherwise stipulated in the Credit，or unless it appears from the insurance document that the cover is effective at the latest from the date of the goods，banks will not accept an insurance document which bears a date of issuance later than the date of loading on board or dispatch or taking in charge as indicated in such transport document．

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