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【单选题】
人体的血液循环系统由血管、心脏和血液组成.下列有关叙述正确的是( )A.
血液由血清和血细胞组成
B.
心脏主要是由肌肉组织构成的
C.
体循环始于右心室
D.
肺动脉里流的是动脉血
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A.
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B.
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C.
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D.
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