皮碗密封一般使用在常压下，压差在（）Mpa之间。 ["0.5～0.6","0.4～0.5","0.3～0.2","0.1～0.2"]
目前，下列哪些业务是2G和3G同名业务（） ["手机音乐","手机上网","手机报","手机邮箱","来话宝"]
液压系统的压力阀在卸荷状态时，其压力应不超过（）Mpa。 ["0.05～0.10","0.10～0.15","0.15～0.20","0.20～0.25"]
油缸的活塞和活塞杆的同轴度应小于（）mm。 ["0.04","0.03","0.02","0.01"]
油泵和原动机之间一般应保证同轴度误差不大于（）mm，倾斜角不大于1º。 ["0.2","0.1","0.08","0.05"]
嫩枝扦插和硬枝扦插的区别有哪些？
