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【单选题】
有人以糖精注入人体臂静脉 ,9~16 秒后 , 舌有甜味 , 糖精由臂静脉至舌所经过的循环路线是 。 1臂静脉 上腔静脉 右心房 2接肺循环 3接体循环 4接左心室 主动脉 颈动脉 舌动脉 舌毛细血管
A.
① ④
B.
① ② ④
C.
① ③ ④
D.
① ② ③
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A.
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