题目内容
门静脉由哪两条静脉汇合而成（ ）。
2021-11-06
A.肠系膜上静脉初肠系膜下静脉
B.肠系膜上静脉和脾静脉
C.胃左静脉和肠系膜下静脉
D.脐静脉和肠系膜上静脉
E.肠系膜下静脉和脾静脉
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