acceptable response time的用法和样例：
- I despise his refusing to accept responsibility.
- Can the system meet its response time goals?
- Response time for a step change is approximately 500 msec, which is acceptable for most current-loop control devices, such as control valves.
- Quality of service-a network or system agreement that specifies uptime, response time, acceptable error rates and other conditions for a given service and designated user base.