在胃肠功能监测中被认为是胃排空定量分析金标准的是() ["超声","充气式测压法","充液式测压法","放射性核素影像法","恒压力和恒张力监测"]
TELNET协议主要应用于哪一层()。 ["应用层","传输层","Internet层","网络层"]
以下属抗代谢类抗肿瘤药物的是() ["洛莫司汀","氟尿嘧啶","丝裂霉素","长春碱","顺铂"]
以下属细胞毒素类抗肿瘤药物的是() ["甲氨蝶呤","阿霉素","环磷酰胺","喜树碱","秋水仙碱"]
肺动脉瓣P亢进,固定分裂见于() ["房缺","室缺","未闭","法洛四联症","主动脉缩窄"]
当心肌收缩力减弱时,为了保证正常的心排血量,机体通过下列机制进行代偿()、()、()。