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【单选题】
下列关于各类血管功能特点的叙述，哪一项是正确的A.
血管前括约肌属于血管前阻力，交感缩血管纤维的分布极少
B.
主动脉与大动脉有弹性贮器的作用，使血液能在血管中匀速流动
C.
微静脉口径不变时，微动脉舒张有利于组织液进入血液
D.
静脉的舒缩活动是促使静脉血回流入心脏的主要动力
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