前级泵 [机] backing pump ; forepump
前级真空 fore vacuum ; prevacuum
前级真空泵 backing pump ; backing vacuum pump ; preevacuation pump ; fore pump
前级扩大器 PRE AMPLIFIER ; PreAmp
前级 pre-amp ; pre-amplifier ; preceding stage
前级旁路 PREAMP BYPASS
前级放大器 preamplifier ; front amplifier ; Preamp
前级管道 foreline ; fore line
前级过滤器 Prefilter
前三个强度级几乎可以区分所有字符。
Almost all characters can be distinguished by the first three strength levels.
在参与事务中的锁超时事件前执行的所有sql语句信息，如语句文本、使用的隔离级、执行顺序等等。
Information about all SQL statements executed before the lock-timeout event in the participating transactions, such as statement text, isolation level used, order of execution, and so on.
我每次更换后级电子管的时候是不是必须把前级管也一起换？
Do I need to replace my driver tube every time I replace my power tubes?
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