When executing a SQL workload,you choose to generate execution plans only, without collecting execution statistics. Which two statements describe the implications of this?()
A. It produces less accurate results of the comparison analysis.
B. It automatically calls the SQL Tuning Advisor for recommendations.
C. It shortens the time of execution and reduces the impact on system resources.
D. Only the changes in the execution plan,and not performance regression,are detected.
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动力换档变速箱分定轴式和行星式,这两种变速箱换档时都不需要切断动力。
A. 正确
B. 错误
制动管系组装,法兰用密封圈须为E型密封圈,组装法兰及压紧式快装接头须()
A. 使用组合扳手
B. 使用扭力扳手
C. 使用风动扳手
D. 使用呆扳手
在任何情况下,500KV闸刀允许进行拉、合电压互感器、避雷器和变压器中性点操作。
A. 正确
B. 错误