题目内容
正常成人甲状腺上动脉的阻力指数（RI)是（ ）
2021-10-14
A.0.1 〜0.19
B.0.2 - 0.29
C.0.3 — 0.39
D.0.4 ~ 0.49
E.0.5〜0.6
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