By 100 % irrevocable documentary letter of credit at sight.

不可撤销的即期跟单信用证.

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The only term of payment we can accept is 100 % irrevocable documentary letter of credit.

我们能接受啲付款条件只有100%不可撤销跟单信甪证.

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So in what condition is the documentary collection an alternative to the documentary letter of credit?

那么在什么情况下选用跟单托收而不选用跟单信用证 呢 ?

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