男生各项素质指标的高峰出现在（） ["11~14岁","15~18岁","19~22岁","23~27岁"]
Which two statements about the DiffServ QoS model are true？（） ["DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.","Network traffic is identified by class， and the level of service is chosen for each class.","The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.","RSVP enables the DiffServ model to provide end-to-end QoS.","The DiffServ model is more scalable than the IntServ model.","The flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet."]
光敏二极管、光敏三极管基于（）。 ["外光电效应","光电导效应","电荷耦合","光生伏打效应"]
人对神灵产生的宗教情感（又叫宗教经验）表现在哪些方面？
资本结构决策的资本成本比较法和每股利润分析法，实际上就是直接以利润最大化为目标的。（）
微生物变异
