Which three causes could prevent a host from getting an IPv6 address with stateless autoconfiguration？（） ["The autoconfig command is missing from the router interface.","IPv6 multicast routing is not enabled on the router interface.","IPv6 unicast routing is not enabled on the router interface.","The router interface is configured with a \/63 mask.","The router interface is configured with a \/65 mask."]
《空调列车服务质量规范》各车厢紧急制动阀有包封，印有“危险勿动”警示标志；紧急制动阀手柄施封良好，压力表指示正常。
重介质分选精度最高即Ep值最小的分选方法应用于（）和相对难选煤分选。 ["选煤","煤泥","难选","重介选煤"]
简述优秀班集体的特征。
IBMPC机的8088处于最大模式，其总线仲载是由（）裁决。 ["RQ#\/GT#","8289","8087","8288"]
主耶稣问门徒说；众人说我是谁？他们是怎么回答的？
