《建筑物防雷设计规范》中讲的建筑物内系统是指建筑物内的电气系统和电子系统。
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陕西临潼出土的（），是秦代造型艺术取得划时代成就的标志。
Which three statements are true about DAI？（）
A. DAI intercept all ARP packets on untrusted ports
B. DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the DHCP Snooping database.
C. DAI is used to prevent against a DHCP Snooping attack.
DAI forwards all ARP packets received on a trusted interface without any checks.
E. DAI forwards all ARP packets on untrusted ports.
F. DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the CAM table.
救生艇的座板应尽可能置于艇内低处，并标出每一座位，横坐板的宽度应不小于（）
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