把Windows9X的窗口和对话框作一比较，窗口可以移动和改变大小，而对话框（）。
A. 既不能移动，也不能改变大小
B. 仅可以移动，不能改变大小
C. 仅可以改变大小，不能移动
D. 既能移动，也能改变大小
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6502电气集中选岔电路中的哪个继电器励磁吸起，能证明整条进路已全部选出？为什么？
激光切割过程中遇到异常情况按下“急停”按钮关机后，大约需要多长时间才能开机？
Unicast Reverse Path Forwarding can perform all of these actions except which one？（）
A. examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
B. check to see if any packet received at a router interface arrives on the best return path
C. combine with a configured ACL
D. log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
E. inspect IP packets encapsulated in tunnels， such as GRE
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