Which two statements about queuing mechanisms are true？ （） ["FIFO queuing is only appropriate for slower serial interfaces","weighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfaces","only one queuing mechanism type can be applied to an interface","weighted fair queuing does not require the configuration of access lists to classify traffic ","flow-based weighted fair queuing provides for queues to be serviced in a round-robin fashio"]
在转速、电流双闭环直流调速系统中，若要改变电动机的转速，应调节什么参数？改变转速调节器的放大倍数Kn行不行？改变电力电子变换器的放大倍数Ks行不行？改变转速反馈系数α行不行？若要改变电动机的堵转电流，应调节系统中的什么参数？
（）强调课程设计和教学过程要遵循一定的顺序与步骤，（）高度重视学习中的情感因素？ ["行为主义流派，人本主义流派","建构主义流派，认知学派","人本主义流派，行为主义流派","建构主义流派，人本主义流派"]
《公共卫生管理条例》规定公共场所的许多项目必须符合有关卫生标准，下列项目，不属于《条例》中规定的必须达标的项目的是（） ["空气","水质","采光","卫生措施","清扫消毒的时间"]
漕运
科学管理的意义
