题目内容：
主动脉在维持舒张压的重要作用是
A．口径大 B．管壁厚
C．血流速度快
D．管壁的顺应性
E．对血流的阻力小
参考答案：
答案解析：
单选题：主动脉在维持舒张压的重要作用是
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B．管壁厚
C．血流速度快
D．管壁的顺应性
E．对血流的阻力小
B．管壁厚
C．血流速度快
D．管壁的顺应性
E．对血流的阻力小
输血的原则是
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