A.0.25%~0.75% B.0.25%~1.0% C.0.75%~1.25% D.10.5% E.2.0%
A.大腦皮質(zhì) B.腦干網(wǎng)狀激活系統(tǒng) C.類脂質(zhì)含量高的組織 D.大腦灰質(zhì) E.脊髓
A.2~3倍 B.4~5倍 C.6~8倍 D.大于10倍 E.相差不多