题目内容：
根据以下内容回答题：A vessel which has brought any imports or has loaded exports can(1)the port only when written permission，known as(2)，is granted by the(3)．Application for port clearance has to be made before the intended(4)of the vessel and has to be accompanied by the(5)showing particulars of the cargo loaded and such other documents as may be required by the customs anthorities．
请回答第1题：（ ）
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答案解析：