Which of the following statements concerning IGMP are correct?(Choose all that apply.)()
A. With IGMPvl, queries are sent to a specific group
B. Hosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibility
C. An IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are present
D. With IGMFV2, a leave message is supported
E. An IGMPv2 host will send an IGMFVl report on an IGMFVl router
F. An IGMPv2 router can only allow IGMPv2 hosts to execute a join request
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绘制零件工作图程序中的检查零件草图底稿是指根据零件草图核对零件()是否完全体现。
A. 尺寸
B. 形位公差
C. 表面粗糙度
D. 形状
E. 结构
F. 技术要求
利用钻时可以判断油、气、水层的厚度,并能准确划分出油、气、水层的顶、底界面。()
A. 正确
B. 错误
非参与优先股指的是只能按规定分得固定股息,无权再参与对本期剩余盈利分配的优先股。
A. 正确
B. 错误
按稳压电路实现的方法不同,稳压电源可分为三种:线性稳压电源、()、开关稳压电源。