凤凰作为前级远超过我的期望。
是以罗茨泵为主泵，以旋片泵为前级泵串联而成。
Roots pump is the main pump to pump for the former spin-pump series from.
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?
在真空系统中，这种泵可单独使用，或作为增压泵、扩散泵等的前级泵。
Use: May serve as the transmission in the oil transfer system, the booster pump.
她小学六年级辍学，她的前三个孩子和她的情况差不多。
Her education stopped in sixth grade, as did that of her first three children.
前一节介绍的身份验证方法是用户级安全措施。
The authentication described in the previous section is user-level security.
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.
前一小节讨论了如何在RequisitePro项目级上进行更新。
The previous section discussed how to update at the RequisitePro project level.
或者姚明在受伤前打出的是MVP级的数据？
前一位升级了吗？
没有哪个前金球奖得主遇到这样的危机， 而且没有哪个世界级球员踢得这么糟。
There is no post-Golden Ball crisis and there is no world class player playing badly.
如串级控制、前馈控制、大滞后控制等。
Such as cascade control, feedforward control, large time delay control.
如串级控制、前馈控制、大滞后控制等。
Such as cascade control, feedforward control, large time delay control.
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