肝海绵状血管瘤最危险的并发症是()
A.压迫十二指肠引起上消化道梗阻
B.肿瘤破裂引起腹腔急性大出血
C.肝功能衰竭
D.上消化道大出血
E.肝性脑病
参考答案:B
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试述皮肤的吸收作用主要通过哪些途径。