“判断好来球方向和落点，侧身后退左肩对网击球时右手臂弯曲，将拍引自头后，然后右脚蹬地以肩为轴上臂带动前臂快速向前上方甩腕”是羽毛球击球中的（）技术。 ["正手高远球","击平高球","正手扣杀球","抽球"]
影响学生对班级管理适应的因素有：（）。 [" 学生自身的因素","师生关系的类型、特征","师生交流的阻隔","班级的集体规范","教师自身的行为"]
Refer to the exhibit. Based on this configuration, what type of marker is achieved?（） ["Single-rate，two-color marker","Three-rate，two-color marker","Two-rate，three-color marker","Single-rate，three-color marker"]
Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem?（） ["All of the routers need to be configured for backbone Area 1.","R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.","A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.","The hello and dead interval timers are not set to the same values on R1 and R3.","EIGRP is also configured on these routers with a lower administrative distance.","R1 and R3 are configured in different areas."]
要求气门弹簧上、下端面与气门杆中心线（），气门弹簧有适当的弹力。 ["平行","在一条水平线上","垂直","相交"]
简述知识管理的编码策略及其特点。
