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19. Tĩnh mạch tinh hoànA. Tĩnh mạch tinh hoàn trái đổ về tĩnh mạch thận tráiB. Tĩnh mạch tinh hoàn phải đổ tĩnh mạch chủ dướiC. Tĩnh mạch tinh hoàn trái đổ về tĩnh mạch chậu chung tráiD. A và B đều đúng
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