第18题: [单项选择]下列哪一项与野鸭水中游水和取食无关()。 A. 体似平底船; B. 喙扁而阔,边缘有锯齿; C. 趾间有蹼; D. 羽毛可作被褥的填充材料。 参考答案:D
第19题:[简答题]CRSC is a core enterprise for safe operation of China's rail transportation; a representative of its national industry of train control system technologies for high speed railways (HSRs); and a leader of its core technologies for HSRs leading the global railway industry. 参考答案:中国通号是保障国家轨道交通安全运营 的核心企业,是我国高铁列控系统技术 民族产业的代表者,是我国高铁最核心 技术引领全球铁路行业进步的佼佼者。