第4题: [填空题]Bionicists do research on the unique quality of owls’ sensitive heating and engage in designing ______. 参考答案:sensitive mechanic ears for listening to enemy sonar 答案解析:文章第十四段最后一句话指出“…those engaged in designing sensitive mechanic ears for listening to enemy sonar…”设计敏感
第5题: [多项选择]烟机突然跳闸停机自保阀门动作,正确的是()。 A. 出口单向阀关闭 B. 烟机入口闸阀关闭 C. 烟机入口蝶阀关闭 D. 烟机旁路碟阀关闭 参考答案:A, B, C