患者，男性农民，右眼被谷物弹伤，视物模糊1个月就诊。检查：右眼视力0.5，结膜充血，角膜有黄白色病灶，污秽，伴前房积脓。最可能的诊断是() ["A．铜绿假单胞菌(绿脓杆菌)性角膜溃疡","B．真菌性角膜溃疡","C．蚕食性角膜溃疡","D．病毒性角膜溃疡","E．淋菌性角膜溃疡"]
简述艾滋病的传染源和传播途径。=
中药煎煮要怎样进行？服药有哪些要求？
为显示流速极低的血流灌注信号，宜用() ["A．A型超声","B．B型超声","C．M型超声","D．CDFI","E．CDE"]
角膜异物剔除后1天，患者有畏光、流泪、视力下降，结膜混合性充血，角膜表面有黄白色病灶，前房积脓。其最佳治疗药物为() ["A．氧氟沙星(泰利必妥)滴眼液","B．两性霉素滴眼液","C．利巴韦林(病毒唑)滴眼液","D．硼酸滴眼液","E．地塞米松滴眼液"]
简述艾滋病的发病机制。
