Which of one the following fields is contained within an IEEE Ethernet frame header?()
A. source and destination MAC address
B. source MAC address and destination network address only
C. source and destination network address only
D. source network address and destination MAC address
E. source and destination MAC address and source and destination network addre
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加强农村低保与扶贫开发政策的有效衔接要做好哪几个方面的衔接?
生产设备、厂区建筑发生火灾,直接经济损失达到()万元者,构成重大设备事故。
A. 1
B. 10
C. 30
D. 50
隔离开关的触头间应接触紧密,两侧的接触压力应(),且符合产品的技术文件要求。