阿托品在眼科方面用于() ["A．缩瞳，调节麻痹","B．扩瞳，调节麻痹","C．扩瞳，降低眼压","D．扩瞳，调节痉挛","E．扩瞳，视近物清楚"]
肺转移瘤并发自发性气胸，以下列哪种原发肿瘤多见() ["A．尤文肉瘤","B．骨肉瘤","C．骨软骨肉瘤","D．滑膜肉瘤","E．骨旁骨肉瘤"]
试述法洛四联症的病理生理改变?
试述法洛四联症患儿为什么可在生后3～6个才出现青紫?
体内肺表面活性物质减少可导致() ["A．肺泡回缩力减少","B．肺泡稳定性增加","C．肺泡表面张力减少","D．肺泡顺应性降低","E．肺泡毛细血管血浆外渗减少"]
简述法洛四联症的病理改变?
