在我国制定的《海运出口危险货物的包装检验管理办法》及补充规定中要求包装检验证书有效期按包装形式分为()。 ，
A. 一年、一年半和二年
B. 半年、一年和一年半
C. 二年、二年半和三年
D. 一年半、二年和二年半
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市、县国土资源部门对挂钩试点工作要实行动态监管，每()年将试点进展情况向上级国土资源部门报告。
A. 半
B. 一
C. 二
D. 三．
What is a documentary letter of credit？______.
A method of lending against documentary security
B. A conditional bank undertaking to pay an exporter on production of stipulated document-tation
C. An international trade settlement system biased in favour of importers
D. All of the above
Who makes the first presentation of documents under a transferable credit？______.
Applicant
B. First beneficiary
C. Second beneficiary
D. None of the above
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