[单选题]当某因素的各单独效应随另一因素变化而变化时,称这两个因素间存在()
正确答案 :C
交互效应
[多选题]An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL (Choose three.)()。
正确答案 :DEF
DNS
HTTP
POP3
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