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Tributary trade
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Tributary trade
Encyclopedia
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国际关系史
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Tributary trade
勘合贸易
中国明朝时期的对外贸易制度。因采用“勘合符”作为贸易许可证而得名。又称贡舶(赐)贸易。
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unijunction
unijunction switching transistor
unijunction transistor
UNILAG
unilamellar vesicles
unilamellar vesicles (ULV)
unilap
unilateral
unilateral act
unilateral agenesis of kidney
unilateral authentication
unilateral boundary value problem
unilateral conductivity
unilateral constraint
unilateral constraint condition
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