第10题: [单项选择]For our bodies to function properly, we should A. sleep for at least eight hours per night B. believe that we need less sleep as we age C. adjust our activities to the new inventions D. be able to predict the rhythms of our biological docks 参考答案:A
第23题: [单项选择]对于结构呈巨块状整体结构,开挖后围岩稳定、不坍塌、可能产生岩爆,围岩弹性纵波速度Vp>4.5km/s的围岩,可判定为()级围岩。 A. Ⅰ B. Ⅱ C. Ⅲ D. Ⅳ 参考答案:A 答案解析:此题主要考查隧道围岩级别的判定。根据教材表1C415011铁路隧道围岩分级判定表,Ⅰ级围岩开挖后的稳定状态为围岩稳定、不坍塌、可能产生岩爆,围岩弹性纵波速度Vp为>4.5km/s