Which of the following protocols uses both TCP and UDP ports?（） [" SMTP"," Telnet"," FTP"," DNS"]
针对战时共产主义政策的弊端，有人对列宁说：我们过去认为可以一举消灭商品经济，走向社会主义，但实际情况表明，必须发展商品经济。此后，苏俄政权（） ["采取余粮收集制","建立战时经济体制","实施新经济体制","颁布新的土地法令"]
Which statement is correct about the Cisco QoS SDM wizard？（） ["the best-effort class will need to have its percentage entered in the QoS Policy Generation screen","SDM QoS wizard provides real-time validation of application usage of WAN bandwidth","the SDM wizard is not able to monitor QoS policing traffic","the SDM QoS wizard is pre-installed on enterprise router"]
为幼儿提供和同伴及教师交流、讨论、合作和分享经验的机会，同时更容易让幼儿主动积极地操作材料，并可按自己的速度和方式去做所要求做的事的教学方式是（）。 ["集体教学活动","小组教学活动","个别化教学活动","混龄教学活动"]
简述网损、网损率的概念。
情绪调节
