第20题: [单项选择]Purging air from a hydraulic system is necessary when() A. adding small amounts of oil to the system B. the system has been overheated C. the system has been drained and then filled with new oil D. the system has been idle for a long period of time 参考答案:C
第28题: [单项选择]基底标高不同时,砖基础的砌筑顺序应为( )。 A. 低处砌起,由高处向低处搭接 B. 低处砌起,由低处向高处搭接 C. 高处砌起,由高处向低处搭接 D. 高处砌起,由低处向高处搭接 参考答案:C 答案解析:[解析] 《砌体工程施工质量验收规范》(GB 50203—2002)。 3.0.3砌筑顺序应符合下列规定: 1.基底标高不同时,应从低处砌起,并应由高处向低处搭砌。当设计无要求时,