Which two are features of IPCC Express Enhanced?（） ["IVR Port Recording ","HTTP Triggers ","Supervisory Silent Monitoring ","sending e-mails ","Database Integration ","keystroke macros&e"]
When issuing the CROSSCHECK command in RMAN， if a backup file CANNOT be found， to what status is that file set？（） ["DELETED","OBSOLETE","EXPIRED","UNKNOWN"]
What is the best way to ensure that IKE/ISAKMP packets are not dropped when QoS is enabled on the uplink interface of the Teleworker router?（） ["QoS and IPSec should never be used together. ","IKE\/ISAKMP packets are DiffSERV codepoint CS6, so the traffic is never dropped.","Source IKE\/ISAKMP packets off the loop-back address. ","Classify IKE\/ISAKMP packets so they are appropriately prioritized."]
内燃机按（）分类，可分为往复活塞式内燃机、旋转活塞式内燃机、或轮式内燃机等。 ["基本工作原理","所用燃料","工作循环冲程数","旋转活塞类型"]
简述计算机硬件与软件的关系。
热油炉烟道气温度高以后烟道挡板位置应如何调节？
