那么信用证的种类又有哪些？他们的各自作用又是为何？
What are the different types of letters of credit and how are they used?
信用证按其作用、形式和机制分作不同的种类。
Letters of credit are classified into different types according to their function, form, and mechanism.
根据情况信用证可以分为很多种类。
Letters of credit can be divided into many kinds depending on the circumstances.
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