第11题: [单项选择] 有关沥青路面渗水系数的说法:①渗水系数是指在规定的水头压力下,水在单位时间内通过一定面积的路面渗入下层的数量; ②路面渗水系数与空隙率有很大关系; ③剩余空隙率越大,路面渗水系数越大; ④只要控制好路面空隙率和压实度,渗水性能可以完全保证; ⑤路面渗水系数应在路面施工结束后立即进行测试; 完全正确的一组是() A. ①③④⑤ B. ②③④⑤ C. ①②③⑤ D. ①②③④⑤ 参考答案:C
第22题: [单项选择]Under normal conditions, the main source of crankcase oil contamination is attributed to () A. metal particles loosened by wear B. air when air cleaners are not used C. condensation of water vapors D. breakdown of the lubricating oil by dilution 参考答案:D