第8题:[单选题]The PBN concept specifies that aircraft RNAV system performance requirements be defined in terms of the accuracy, ( ), availability, continuity and functionality, which are needed for the proposed operations in the A.A、 capability B.B、integrity C.C、 stability D.D、 security 参考答案:B
第33题: [单项选择]关于艾滋病肺部感染的叙述下列哪项是错误的 A. 70%~80%的患者可经历一次或多次肺孢子虫肺炎 B. 因机会性感染而死亡的病例约一半死于肺孢子虫肺炎 C. 临床表现主要是慢性咳嗽及短期发热,呼吸急促和发绀 D. 多数病人肺部能闻及啰音 E. 肺部X线征为间质性肺炎,但无特异性 参考答案:D