We open our irrevocable clean credit up to an aggregate amount of sf 1 , 200 我开出不可撤消光票信用证，金额总数为1200瑞士法郎。
2.
Clean credit is generally used in non - trade settlement , and documentary credits are mostly used in international trade 光票信用证主要用于非贸易结算，而在商品贸易中一般使用跟单信用证。
3.
Well , documentary credits are very common . they require drafts drawn on them , and documents of title to the cargo . clean credits aren ' t supported by these documents 唔，跟单信用状使用非常普遍，它需要根据它开立的汇票以及货物所有权的证明文件；不跟单信用状就不需依靠这些单据了。
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