调整柱塞式喷油泵滚轮体的调整螺钉或调整垫块，可以（）。 ["改变各分泵的供油提前角及各分泵的供油间隔角度","改变供油压力","改变循环供油量","改变各分泵的有效行程"]
水泥砂浆抹带完成后应立即用吸水性强的材料覆盖，（）3~4h后洒水养护； ["2~3","3~4","4~5","5~6"]
在亚热带地区的植物一般以（）作为生物学零度 ["0℃","5℃","10℃","15℃"]
Which statement correctly describes the function of Oracle9i Cache Fusion feature？（） ["It provides each session with its own view of the database at a different point in the past. ","It enables you to execute scalable applications on a clustered database without having to partition the users or the database tables. ","It lets you dynamically reassign memory in your database buffer cache to different block buffer sizes. ","It allows you to add new sites to multimaster replication environment without quiescing the master definition site."]
传统铅蓄电池点火系统有哪些缺点？
金属材料的力学性能是（），力学性能的指标有（）、（）、（）、（）、（）等。
