存在（）的行为，是承担法律责任的前提。
土壤水吸力
安全生产委员会由（）组成。 ["企业主要领导","安全管理部门负责人","有关职部门负责人","员工代表或工会代表","总工程师"]
酸、碱卸车前的军准备和要求？
As an experienced technician， you are responsible for infrastructure design and globalconfiguration changes. You are asked to deploy a Voice over Wireless LAN for your company. Ifthe cells have the same channel， the separation between them should be（） [" 19dbm"," 10dbm"," 67dbm"," 86dbm"]
简述教育制度的社会特征。
