A.>1:1:1 B.<1:1:1 C.1:1:1 D.<1:1:1.5
A.700 B.800 C.900 D.1000
A.脚气病 B.“3D”症状 C.甲状腺肿 D.高碘性甲状腺肿
A.1/3 B.1/4 C.1/5 D.1/6