Which three statements are true about the application of QoS models？ （） [" The DiffServ model requires applications to signal the network with QoS requirements."," The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses."," The DiffServ model requires RSVP."," The best effort model is suitable for applications such as file transfer and e-mail"," The IntServ model requires applications to signal the network with QoS requirements."," The IntServ model attempts to deliver a level of service based on the QoS specified by each packet"]
以下不属于党的基本路线的是（） ["坚持四项基本原则","坚持党的领导","坚持改革开放","以经济建设为中心"]
如何理解孔子的美育观？
篆书包括（）、（）、（）、（）四种。
塔式起重机的起升机构不宜采用（）钢丝绳。 ["同向捻","交互捻","混合捻"]
劳动力的自愿和非自愿失业
