下列种间关系（）属于互利互生。 ["豆科植物与禾本科植物","豆科植物也根瘤菌","鸟与树"]
Which two statements or sets of statements are true about the application of the qos pre-classify command？（） [" If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header."," The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary."," With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel."," With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface."," With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface."]
水土保持规划
琥珀热处理特征包体为（） ["气泡呈扁平拉长状定向排列","变为半可切性","遇乙醚变软","太阳光芒"]
团体寿险的特点有（） ["对团体有一定的选择标准","免体检","保险金分等级制定","有保费优待","由雇主支付保费"]
市场
