留守儿童长期缺失亲情抚慰，缺乏父母直接的关爱与呵护，因此对父母缺乏积极的情感反应，表现出对父母亲的冷漠、疏远，有的甚至会怨恨父母。
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GB/T232-1988规定，当材料厚度大于25mm时，应将冷弯试样厚度加工成（）。
A. 25mm
B. 20mm
C. 15mm
有理投诉率是指（）或（）或被上级领导点名批评，并经查证属收费人员操作失误或（）对公司声誉造成不良影响的情况。
Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）
A. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC after AP1 issues an IGMP query.
B. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC independent of AP1 multicast member status.
Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, provided that another client has already joined that multicast.
D. Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, regardless if any other clients have already joined that multicast.
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