题目内容
（请给出正确答案）
[主观题]
A vessel which has brought any imports or has loaded exports can leave the port o
nly when written permission, known as "port clearance", is granted by the local authorities. （）
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A．岩蝶综合征
B．眶尖综合征
C．垂体蝶窦综合征
D．眶上裂综合征
E．颈静脉孔综合征
