发现汽轮机胀差变化大，首先检查主蒸汽温度和压力并检查汽缸膨胀和滑销系统，进行分析，采取措施。
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DHCP snooping on Cisco Nexus 1000V Series Switches acts like a firewall between untrusted hosts and trusted DHCP servers by doing which of these？ （）
A. validates DHCP messages received from untrusted sources and filters out invalid response messages from DHCP servers
B. intercepts all ARP requests and responses on untrusted ports
C. builds and maintains the DHCP snooping binding database， which contains information about untrusted hosts with leased IP addresses
D. uses the DHCP snooping binding database to validate subsequent requests from untrusted hosts
E. limits IP traffic on an interface to only those sources that have an IP-MAC address binding table entry or static IP source entry
专利法实施细则第12条规定，发明人应当是对发明创造的实质性特点作出创造性贡献的人，因此，审查员应当对请求书中填写的发明人是否符合该规定作出审查。
A. 正确
B. 错误
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