【简答题】Without noticing it we may fail to ___ enough time and effort in maintaining our relationships.
【单选题】Without putting in enough time and energy, your chances of success in learning second language is ( ).
【单选题】Without enough time, the Smiths took a taxi to go to the airport
【单选题】某台液压泵如果不是直接从液面为大气压的油箱中吸油,而是采用压力为p2的辅助低压系统向该泵供油。假设泵转速、效率以及液压缸的负载均不变,试分析采用辅助低压系统后,泵的输出流量qp 如何变化?