当母线内部故障有电流流出时,为确保母线保护有足够灵敏度,应()。
A. 适当增大差动保护的比率制动系数
B. 适当减小差动保护的比率制动系数
C. 适当降低差动保护的动作门槛值
D. 适当提高差动保护的动作门槛值
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机械式调速器靠飞锤离心力的大小拉动供油拉杆与齿条,故拉动力很大。
A. 正确
B. 错误
From the V$SESSION_LONGOPS view, you find that some of the database users have long-running queries that consume a lot of CPU time. This causes performance problems for other users in the database, who have much shorter queries. You would like to make sure that the users with large queries do not use all the CPU time, but you still do not want to terminate them with an error message. Which method would you follow to achieve this?()
A. set the CPU time per call in the users profile
B. set the CPU time per session in the users profiles
C. set the CPU levels for the users’ group using Resource Manager
D. set the TIMED_STATISTICS parameter to TRUE in the parameter file
寿山艮岳是山水宫苑的范例。
A. 正确
B. 错误
简述ZB25/ZB45包装机“气压不足”故障的显示条件、产生的原因及排障措施。