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【单选题】
关于血液凝固的叙述,错误的是A.
血液凝固是复杂的生物化学过程
B.
许多凝血因子是在肝脏中合成的
C.
凝血过程中需要Ca2+参与
D.
内源性凝血比外源性凝血速度快
E.
除凝血因子Ⅲ以外，其他凝血因子都存在于血液中
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