它利 用了诱发电位与刺激锁时(time-locked)的特点,通过平均叠加多次刺激产生的响 应,将与刺激没有锁时关系的工频干扰和随机噪声减弱,同时保留诱发电位成分。
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在需要多个锁时,使用分层方式。
使用悲观会话锁时还需注意一些问题
There are also several issues to be aware of with pessimistic session locks
当获得少量的行锁时,行锁就会自动地逐渐升级为表锁。
After some small number of row locks are obtained, a lock escalation to a table lock will occur automatically.
What does that say about your thinking about ? your fellow citizens when you arm yourselves going for a trip, of his fellow citizens ? when he locks his doors at night or of his children ? and servants when he locks his chests?
你们觉得你的同胞对你,带着武器骑行有什么看法,把门闩起来的时候,对同胞们是什么看法,把箱子锁起来时对自己的子女仆人是什么看法?
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