题目内容

____Using a third currency in collecting payment is the best protection against currency risk for the seller.

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____Since under L/C the sell gets payment from a party independent of the buyer it is the safest mode for him.

____Open account and payment in advance indicate the minimum and maximum risk for the importer

____Dishonor only refers to the rejection to the presentation for payment , but not rejection to the presentation for acceptance.

与速尿合用，使耳毒性增强的是

A. 青霉素
B. 氯霉素
C. 四环素
D. 氨基甙类