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?
凤凰作为前级远超过我的期望。
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.
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.
或者姚明在受伤前打出的是MVP级的数据？
前一位升级了吗？
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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